3 different ones come up for sale on eBay in the past 5 or so years, though one of those was not marked 10k (but it was serial numbered and resembled in every other respect the ones I have seen that are marked). The seller didn't know whether it was gold and indicated as much in the auction, so it ended up going for less (~$450: I was second bidder ).

Does anyone know the history or have information on the use and metallic composition of the ones that weren't marked 10k?

Brent J. Jensen
R-8007
orbis non sufficit