Thanks for your reply …you are correct they are either silver or gold. Some collectors are a bit snooty about exonumia but as I like coins with aeroplanes on them, I m always tempted by them .
I’m always puzzled by my choice of coins to collect …I like crown coins mainly from Uk dependencies. As Numista seem to hardly show any collectors of these coins and never for swapping. You would be drawn to the conclusion that hardly anyone collects them .
However , the price of them on eBay and bidders would indicate the opposite, so where are they on this site …as I say puzzled