I bought a bag of various UK coins and there were quite a few threepenny coins. They are usually nickel/brass, but one was copper. I've never seen a copper threepenny before, has anybody on this forum?
I have to say I have seen many of the brass threepences in the same colour, so I don't think is a copper example - just environmental damage. Someone once suggested that immersion in a urine solution would produce this colour.
Interesting anecdote for me. Many years ago, I visited the Trevi Fountain in Rome. Didn't have any coins in my pocket. So, I wrote an IOU on a piece of paper, and threw that in, instead.
Hello Hank and I've dug up quite a few of these metal-detecting, and all of them were this colour when I dug them up. It's just environmental damage. Here's a 1966 one I dug up:
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