I have a 1901 British half crown coin, and I'm looking to find a protective case to put it in, preferably a hard, air-tight case. The only problem is that it isn't the same size as any US coin (~32mm across and 2mm thick). Does anyone know of a store that may carry the right size cases, or maybe a one-size0fits0all case? Thanks in advance for any help! Note: The coin pictured isn't the actual one I own, but it's the same design and year
They sell 32mm "airtite ring type holder" on eBay, says its for Krugerrand, which is 32.7mm. I`d say your coin should fit in it.