Coins worth keeping that were minted after 1940

My question is about circulating coins minted after 1940's. In general, people say they are worth only face value.

However, is there anything that is more worth keeping than that?
Is there any country in particular which coins are so hard to get that it is worth keeping them?

Is mintage a valid indication that something is worth keeping? For example a lot of coins from Guernsey and Jersey from 1980's are 50k mintages, but megaeasy to get. But something with 10k mintage is not.

Also, I am trying to get more African coins to my collection, but there isn't many to be found in swaplists. Would that be good indicator that for example money from Malawi from 60's (random example) would be worth keeping? Or is it more of an indication that people in Numista just aren't having many of them due to geographic location?

Also, I hear that there are countries where it is illegal to bring coins out from there. Again, is this indication that we should keep them if getting some?

The 1942 and 1943 coins from Fiji were interesting.  The previous coins were minted at the British mint and shipped from England.  During the war however, it was considered too risky and the coins were instead minted in America and shipped across to Fiji from there.  So all the 1942 and 1943 Fijian coins have the "s" mintmark from the San Francisco mint, The silver coins (sixpence, shilling and florin) were minted to the US silver standard of 90% silver too, as opposed to the 50% silver they had before and after those two years.  They're definitely worth having.  Also if you're lucky enough to find any 1945 Fijian coins, hold onto them because they're pretty scarce.

African money usually sells for much more than their catalog valuations.
Same with the Channel Islands.
For reasons you mentioned, hard to come by. I don't personally know why that isn't reflective in the catalog, but still.

Depends a lot on why you collect; if it's purely for investment terms, sell all your coins and buy a kruggerrand. That will give higher returns than cheap African coinage ever will.

1950 & 1951 UK penny, 1946 & 1949 3 pence (12 sided).

pretty much any country where they've changed their currency.  New Zealand, Australia, Fiji, New Guinea all used to have pounds, shillings and pence as their currency, New Zealand, Australia and Fiji have changed to the Dollar and New Guinea have changed to the Kina.  So all the old currency is worth picking up.

Just curious, specially because one can't keep track of all countries and stuff, so it is great to have a chance to ask from fellow collectors and try to put this info together somehow. Even to use this knowledge in swaps, or to have an idea that coin that I happened to come by would be worth keeping, even though I already had one of these.

Yea, it would be great to keep a few coins along the way while just collecting and get a few more for them in future than you paid for them, but that is not the main reason for my question. It's the sense of challenge to find more of the "common rarer" ones I guess.
Mostly my question is just down to extra knowledge though. It is good to pick other peoples brains for knowledge that comes best with experience.

 And also odd years like the US 2009 Dand P nickel The D they made 46,800,00 and the P they made 39,840,00
Its a high amount ,but very low for US nickels. but you dont find very much already. I keep al of them if in good shape i find.I think in 10 to 20 years it well be a  "key date". Cheack your country coins from 2008 to 2010.
When the economy was in the dump,less need for coins less made.
                                     yours daryl

Quote: KartWayAlso, I am trying to get more African coins to my collection, but there isn't many to be found in swaplists. Would that be good indicator that for example money from Malawi from 60's (random example) would be worth keeping? Or is it more of an indication that people in Numista just aren't having many of them due to geographic location?

 yes, African coins are always hot, whenever I find some in a bulk lot they go onto my swap list, and usually don't stay long.