What's your coin with the highest Numista rarity index?

Quote: "jimpop"​I have a few 97s. I could remove my coin from my collection and make them 100

Quote: "Essor Prof"​I have dozens of NRI 97 coins (no tokens). The last few years I've added 91 new coins to the catalogue. A lot of them still have NRI 97. Among them the Fiji,1 dollar 2010 FIAA World Cup - South Africa tri-metallic series, consisting of 10 coins. All 10 still have NRI 97.
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​https://en.numista.com/catalogue/pieces78195.html

Quote: "ZacUK"​

Quote: "Essor Prof"​I have dozens of NRI 97 coins (no tokens). The last few years I've added 91 new coins to the catalogue. A lot of them still have NRI 97. Among them the Fiji,1 dollar 2010 FIAA World Cup - South Africa tri-metallic series, consisting of 10 coins. All 10 still have NRI 97.
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​​https://en.numista.com/catalogue/pieces78195.html

​​ What a lovely coin !

Quote: "ZacUK"​​​ What a lovely coin !

Quote: "ashlobo"​How do I search to find out the highest NRI in my own collection??

Quote: "CassTaylor"​

Quote: "ashlobo"​How do I search to find out the highest NRI in my own collection??

​​As far as I know there isn't a way to do that....
​You have to do it the old fashioned way

Quote: "ArnoV"​My rarest is my avatar coin, an 1874 Stuiver from Curaçao with a NRI of 94.
​It is actually not a coin nor a token but rather 'emergency coinage'.
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​https://en.numista.com/catalogue/pieces28632.html

Quote: "halfdisme"​​Did you know that your token is also listed in Rulau's "Latin American Tokens" (2nd ed., page 165), as Rulau Cur11? He says the Leyba tokens are harder to find than the contemporary Jesurun and Naar tokens.

Quote: "halfdisme"​Unless I am missing something, the NRI is based on an entire type. Is this correct?

Quote: "Jangofett56037"​A rare chinese commerative coin of the emporor nurhachi 92 last i checked . Also have a few ancient coins, but i cant determine what they are
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Quote: "ElectronJohn"​I have this Drachm - Amisos.
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​I have owned it for 3 years but just added it to this site today. It has a 100 rarity index right now.

Quote: "druzhynets"​

Quote: "ElectronJohn"​I have this Drachm - Amisos.
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​​I have owned it for 3 years but just added it to this site today. It has a 100 rarity index right now.

​​Well, 97.
​100 means that no one has it. If you assign a newly added coin to your collection, it is 100 yet the database updates a bit later making the rarity index 97.

Quote: "ElectronJohn"​

Quote: "druzhynets"​
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Quote: "ElectronJohn"​I have this Drachm - Amisos.
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​​​I have owned it for 3 years but just added it to this site today. It has a 100 rarity index right now.

​​​Well, 97.
​​100 means that no one has it. If you assign a newly added coin to your collection, it is 100 yet the database updates a bit later making the rarity index 97.

​​Yes I figured it would drop once the database updated (and it has) which is why I said "right now". So for a brief moment in time I did have a coin with a rarity index of 100! No matter what else 2020 throws at me I will always have that.

Quote: "GoldenGarfield"​I have 4 or 5 of these tokens in Rome... (NRI 88)
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​https://en.numista.com/catalogue/pieces38319.html
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​in terms of things with a face value, it’s this NCLT from Singapore... sadly it’s covered in extremely ugly residue. (NRI 77)
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​https://en.numista.com/catalogue/pieces38319.html

Quote: "ElectronJohn"​

Quote: "GoldenGarfield"​I have 4 or 5 of these tokens in Rome... (NRI 88)
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​​https://en.numista.com/catalogue/pieces38319.html
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​​in terms of things with a face value, it’s this NCLT from Singapore... sadly it’s covered in extremely ugly residue. (NRI 77)
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​​https://en.numista.com/catalogue/pieces38319.html

​​Both links are the same and go to the Singapore coin.

Quote: "ElectronJohn"​I didn't realize how many tokens were listed on this site. Wow. I have a bunch from different video arcades when I was a kid which I will now have to enter.

Quote: "German_empire5_mark_fan"​These are all of my coins over 90 NRI (22 coins). Also 1 isn't listed on Numista so i'd say its 100. It's listed in Kruase German catalog but without a picture snagged it for $20! It is a Brunswick Wolfenbuttel 1/8 thaler commemorating the death of Duke Heinrich Julius its silver and about in between the size of a US quarter and a half dollar.
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Quote: "ElectronJohn"​

Quote: "German_empire5_mark_fan"​These are all of my coins over 90 NRI (22 coins). Also 1 isn't listed on Numista so i'd say its 100. It's listed in Kruase German catalog but without a picture snagged it for $20! It is a Brunswick Wolfenbuttel 1/8 thaler commemorating the death of Duke Heinrich Julius its silver and about in between the size of a US quarter and a half dollar.
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​​You should add that Brunswick Wolfenbuttel 1/8 thaler to Numista! I would like to see pictures of it. All of the coins you listed are outstanding by the way.

Quote: "ZacUK"​ Would like better pictures than those two though.
​Too dark, in holder, and especially the first picture is cut off at the base.

Quote: "NoIdea"​I have a few 97s, some 100 and I quite like this 97 one from Norway: https://en.numista.com/catalogue/exonumia241709.html
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Quote: "ngdawa"​tnks! Yeah, I corrected my original post. I checked and don’t have any 100. Makes sense now. Tnks again.

Quote: "Moneytane"​I have 2 x 97 coins both half crowns I added.
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​https://en.numista.com/catalogue/pieces195955.html
​By mintmark, alone mine is the only one so far.

2022 It's dropped to 90 and suggests that 8 people own them now
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​https://en.numista.com/catalogue/pieces224715.html
​Mine is the only one, but image is not of my coin (Too worn and possible mine is not genuine).

2022: It's still 97 and the image is a generic auction site example
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​I also have a 91 with my Commonwealth Halfcrown
​https://en.numista.com/catalogue/pieces12951.html
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​It's scarce, but with 11 potential dates, it means that a few other people are bound to have them.
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​The Commonwealth coin has dropped to 90!! Someone else must have bought one.
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​Not a 90, but was glad when Numista accepted my coin as a new index coin for their page
​https://en.numista.com/catalogue/pieces21633.html
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​I only asked them a couple of weeks ago and already its there.
​It replaced a fairly worn coin shown on that page.
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Quote: "tdziemia"​I collect some obscure places that not many people care about, so I have a lot of NRI 97 coins. Many of these I have entered in the catalog within the last year, so those numbers will go down over time, but some have been in the catalog for years.
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wow tdziemia, congrats, I clicked on the links, the philip the rider, blew me away. 👏👏
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Quote: "ngdawa"​I have found a few NRI 97 coins in my collection, and to no suprise it's ancient coins

Quote: "FredStewart"​I don't have many rare coins, but my father has a "rare" commemorative silver medal.
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​The Stewart Society - 250th Anniversary of the '45 Rising
​Numista Rarity index: 100
​150 minted
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​https://en.numista.com/catalogue/exonumia317457.html

Quote: "NoIdea"​

Quote: "tdziemia"​I collect some obscure places that not many people care about, so I have a lot of NRI 97 coins. Many of these I have entered in the catalog within the last year, so those numbers will go down over time, but some have been in the catalog for years.
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​wow tdziemia, congrats, I clicked on the links, the philip the rider, blew me away. 👏👏
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I have some reasonably rare coins but a far few medals and medallion's that are very rare one example is my Curzon Wyllie commemorative medal with a rarity of 97.I only know of one other that went to auction in the early 2000s.

Better late than never…  N#96615

It has the highest NRI in my collection and it is the oldest as well.

Funny story about this coin, I actually found it in a supermarket on the floor, no idea how it got there. It was/is stored inside one of these coin frames.

I have a 97, most of my coins are unexciting though. I am more into banknotes.

This is my piece

N#317463

and since I don't use Numista to log my collection it is a 100. I think I win.

Well done!

If you had logged it, then it's a 97.😉

I just landed one of these at an auction yesterday: N#179654

For now it is 100, and when I log mine, it will become 97.

For coins it’s this one with an index of 97 although the coin was only added to Numista a few weeks ago so it would take time for members who own it to find it on Numista.

I do have this Japanese 100 Yen banknote with an index of 87. Also I have at least 4 Exonumia with the index of 97.

Mr. Midnight

This is my piece

N#317463

and since I don't use Numista to log my collection it is a 100. I think I win.

Well, if I unmark my 97 coins they will be 100 as well, sooo …

Worldwide collection

I do have this Japanese 100 Yen banknote with an index of 87. 

If you own this note could you please make a picture of its watermark, it's always hard to get a hold those unless you own one yourself.

I think 94 is the highest NRI I have when it comes to banknotes:

Danzig, 50 pfennig 1918

Danzig, 50 pfennig 1919

I have a coin of Princely State of Mewar from the 1700s. It ranks 95 on the rarity index and I was a ised 

Just an observation - as the number of members goes up, surely the rarity index should go up too.  

A collector who added a coin to the catalogue in 2018 may well have found that he is the only person on the website with that coin.  Apparently, the rarity index figure given in 2018 for one person having that coin was 97.  But what is that figure of 97 based upon?  If it's a calculated figure, with substantially more members now than in 2018, surely the rarity index should be proportionately more - maybe 98 or 99.   If it's arbitrary, why not 99.

My own contribution (only 92) - 1 Ghirsh / Piastre (WW2 Emergency Coinage) 

97!

N#363378

100 twice but buying coins has caused them to drop. I bought 3 of this tiny Tongan gold coin

N#176703

It was 100 before I bought and listed my 3 copies of the coin, dragging down to 94.

I am also the first Numista member to have this big chunk o gold too

Me buying it bought it down to 97. Also only 300 were minted and how many coins do you have that come in carved chests?

Because of that number it will never drop below around 40 and likely 50 as Maori Tribal members own at least 40 of them of which their high chief has banned from selling on pain of a Maori curse (These coins have numbers too and fortunately mine is not one of them - which means I live - Maori magic scares me a bit more being part Maori myself).

The moral, if you buy or have a Numista 100 coin, listing it drops it to 97 and more than 1 of the coin drops it further.

1000 Yen - Heisei 150 Rarity of 90% though most won't consider it rare it is actually illegal to export these from or import them to Japan in order to maintain the order limit Japan mint places on collector coins.

Note- I appear to have deleted my picture of the Japan mint seal that states it forbids reimportation so here's a coa instead.

LDC63

Just an observation - as the number of members goes up, surely the rarity index should go up too.  

 

A collector who added a coin to the catalogue in 2018 may well have found that he is the only person on the website with that coin.  Apparently, the rarity index figure given in 2018 for one person having that coin was 97.  But what is that figure of 97 based upon?  If it's a calculated figure, with substantially more members now than in 2018, surely the rarity index should be proportionately more - maybe 98 or 99.   If it's arbitrary, why not 99.

 

My own contribution (only 92) - 1 Ghirsh / Piastre (WW2 Emergency Coinage) 

I don't think this logic is correct.

As the number of numista members increses, the likelihood that there is one more member with a given coin should increase, which would make the numista rarity index LOWER, not higher.  

(As best I can tell from the FAQ information, there is no denominator in the Numista rarity index.)

Of my last 10 acquisitions, I have 3 with a Numista rarity index of 97, one with a 95, and two at 100 because they are not yet listed.  (Not because I like to acquire rare coins, but because nobody else on Numista likes to collect the coins that I like to collect!  😄) 

tdziemia

LDC63

Just an observation - as the number of members goes up, surely the rarity index should go up too.  

…

I don't think this logic is correct.

 

As the number of numista members increases, the likelihood that there is one more member with a given coin should increase, which would make the numista rarity index LOWER, not higher. 

 

Of my last 10 acquisitions, I have 3 with a Numista rarity index of 97, one with a 95, and two at 100 because they are not yet listed.  .. 

+1

The rarity index will only decrease as more members join & enter more coins/notes. 

I do have this Japanese 100 Yen banknote with an index of 87.

The rarity index for that 100 Yen note is now 83 (down 4 points since February 2023). 

The rarity index (RI) is a helpful feature here but it should be taken with a grain of salt. If you like to collect tough signature varieties (like I do) then you will discover notes like the Bank of Canada 1937 $5 with a RI of 52 which is pretty low & common. But the first Osborne signature (P-60a) only makes up 3% of all entries & it is almost an impossible note to find. I'm sure there are a lot of collectors out there who like to find the one tough variety amongst a common coin/note.

tdziemia

 

 

Of my last 10 acquisitions, I have 3 with a Numista rarity index of 97, one with a 95, and two at 100 because they are not yet listed.  (Not because I like to acquire rare coins, but because nobody else on Numista likes to collect the coins that I like to collect!  😄) 

 

Exactly this. I have over 100 pieces of Numista RI of 100, because I added them to the catalog, I don't log my collection in Numista, and no one but me is interested in the stuff I collect! 🤓

The Numista Rarity Index is, IMHO, rather meaningless.

1. More recently added coins have a higher NRI.
2. This Canadian and this Australian faux-coins have NRI indices of 91 and 92 respectively. There are actually more Numista members who have these “coins” than the RCM and RAM issued…
3. On individual coin pages, many type collectors click on the first row to add their new coins, whatever year or variety.
4. It wouldn't surprise me a bit if many owners of rare and expensive coins don't add them to their Numista checklist so as not to tempt thieves.
5. In the case of exonumia, there is so much of it out there, and much of it of low value, that there probably is less of an incentive to add such items compared to circulating coins. This is actually my case. So few of the exonumia items I happen to have are in the database that I have not added them systematically as it makes little difference.

I think I understand what LDC63 was getting at when he wrote

as the number of members goes up, surely the rarity index should go up too.

If you think about it, if you had a coin at NRI 97 when there were 100,000 members, and if you're still the only member with that coin now that there are 200,000+ members, in theory the coin is now twice as rare as it was when there were half the members. But as we know, it actually works only in the number of coins reported by members. A single reported coin produces an index of 97, whether there are 100k or 200k members.

Altogether, the NRI is probably somewhat more accurate (or less inaccurate) for modern circulating coins.

why does it got 97 on the first instance, instead of 99?

I remember seeing it explained on a couple of times on the forum (once by FrenchLover if my memory serves me well, either on the French or English side) but can't remember exactly what the reason was, and it's not explained on this dedicated page. Perhaps a note could be added about that? Yet here are some points made on the page:

The Numista Rarity Index is computed from the number of members that have it in their collection and the number of members who offer it for swap. Note that collections from Numista users are not verified so they can't be fully trusted. Multiple entries by the same user are not taken into account to build the index. 

 

The Numista Rarity Index provides a good indication of how easy it would be to obtain an item from another Numista member. So an item with an index lower than 10 is fairly easy to get, while an item with an index greater than 30 will be harder to get in a swap, as not many people have it in the first place. 

 

To be short, the Numista Rarity Index is an indicator of how frequently a coin, a banknote or a piece of exonumia is found within the collection of Numista members. Nothing else.

And, about exonumia:

Exonumia items tend to have a higher Numista Rarity Index because only a small part of the members collect them.

Mr. Midnight

why does it got 97 on the first instance, instead of 99?

 

It's a mathematical function with multiple additional factors that approaches 0 in infinity. It falls very fast in the beginning and slowly at the end.

The Xavier curve:

The Idolenz curve:

Below about 30 the number of members increases very rapidly.

Hmmm..  exponential decay function with variable decay constant?