Any thoughts on this one: https://www.spink.com/lot/19006000503 It looks okay to me and it does look like a letter C but as yet there don't seem to be any other known examples.
I have seen this discussed on other fora. General consensus was "unconvinced", but someone clearly was to pay £1200 for it!
I agree - still seems to be the one known example, and I've seen rings on coins before (some 2010 Australian 20c pieces have a so-called bubble - a raised ring) but this one looks too perfect the tips of the C seem too perfect. Thanks.