It's like an Air-tite holder, but they don't make one for this coin. 36.2 mm inside, 43 mm outside.
I don't have a photo of the broken one, but this is another one I took photos of. Same size, same weight, but not a broken holder.
I've got some British commemorative proof coins from the 1970s, '80s, and '90s. They have little boxes, and COAs. They were passed down from my...
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