As is the case with a lot of collecting hobbies, I don’t think people buy them like they used to, but there is still a market. Coins like that Cook Islands one are actually silver, so they have some intrinsic value, but some of the pure silver coins from private “mints” will sell for little more than the bullion value, so it depends on what a person wants out of the deal. The last UK coin I had that meant anything to me whatsoever was a “Churchill crown” given to me by a late uncle.
The US “State” quarters either make me laugh or anger me. Some of the most trite, PC, DEI, etc platitudes inartfully rendered in base metals. Toy money.
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The Churchill crown would be an exception for me. Churchhill and Roosevelt were allied in WWII
The state coins are absolutely horrific.
https://www.thegatewaypundit.com/2024/10/breaking-michigan-gop-rnc-file-bombshell-lawsuit-against/
BREAKING: MI GOP and RNC File BOMBSHELL Lawsuit Against SOS Benson and Director of MI Elections – Challenge MI’s UOCAVA Rules That Could Allow Non-MI Citizens to Cast Ballots in Critical Swing State