Bug when searching composition in My coins

When I search in the coin catalog with filters United States, Year: 2000 and Composition: Manganese-brass it correctly returns 1 Dollar "Sacagawea Dollar" as shown below. Note the green check mark since I have this coin in my collection.




When I do a similar search from My coins, it doesn't return this coin as shown below:



When I change Composition to All it returns the 1 Dollar "Sacagawea Dollar" with all the other 2000 coins in my collection.

I don't know if any other composition does this. I just happened to stumble on this.

I think the collection search is not as forgiving as the catalog search. But you can't even search for clad materials.
On that point are these really clad coins? Cladding leaves parts of the edge exposed so you can see the core and the presidential coins are solid brass color (maybe plated).

Quote: "Idolenz"​I think the collection search is not as forgiving as the catalog search. But you can't even search for clad materials.
​On that point are these really clad coins? Cladding leaves parts of the edge exposed so you can see the core and the presidential coins are solid brass color (maybe plated).

​You're exactly right. The search in My coins doesn't count Manganese-brass clad copper as being Manganese-brass while the search in Coin catalog does. I just figured out the nickel-copper clad copper is treated the same way.

On your second question, you're completely wrong. I'm now working up a change request to change the composition of all the Native American Dollars (2009-date except for 2021), Presidential Dollars (2007-2016, 2020), and American Innovation Dollars (2018-Date) to Manganese-brass clad copper. In this case, for these coins, the cladding thickness is 1/4 the total thickness (manganese-brass 1/4, copper 1/2 and manganese-brass1/4). Because of the cladding thickness, the edge doesn't show the copper layer as the manganese-brass layer gets smeared over the copper during the punching of the planchets. To prove this (mostly to myself) I sanded the edge of a Presidential Dollar and a Sacagawea Dollar. Pics below:

Hello,

There is indeed a discrepancy between how the search by composition works between the catalogue and My coins.

The search in the catalogue returns any coin containing the given metal, even if it is just the clad of the outer ring of a bimetallic coin for example.

The search in My coins works differently: each coin is assigned a "main" composition and it is searchable only by this composition. For example, you won't find a coin if you search for the plating/coating material; and you will find a bimetallic coin only by searching "bimetallic". The reason for that is to match the compositions show in the chart of My coins. In this chart, each coin is only listed for a single composition to avoid duplicates and wrong statistics. When you click on a slice of this chart, the search returns exactly the coins which were counted for that slice, even if it corresponds to a metal which is partly present in other coins.

I'm not sure how we could solve this issue: either we have a discrepancy between the search of My coins and the search in the catalogue, or we have a discrepancy between the chart of My coins and the search of My coins.

My intent for doing this search was to get a listing of all my US "golden" dollars (Sacagawea, Native American, Presidential and American Innovation). I knew that clicking the icon for Manganese-brass under Compositions on My coins page wouldn't work as some are (correctly) listed as being Manganese-brass clad copper. I figured I could use the search function instead assuming it would function the same as the search on the Coin catalog. Now that I know it's not a bug but by design I have no problem with it staying as is. I'll leave it up to others to decide if there should be consistency in the two search functions.