Diameter 38.61 mm Thickness 3.2 mm Shape Round Where can I get information about transfering this coin from it's celophane sealer to a round plastic case? It originally came with the celopahane wrapper and I've had to tape it at the bottom since I received it that way.
What purpose do you want it in a plastic case? If you want it better protected, you can self-slab, or encase it. If you want a chain of evidence that it is a proof, or something special, I'd send it in to a TPG to have it graded, authenticated and slabbed.
Are you sure it's silver? The silver proofs came in a capsule within a blue cased box. The relief was also frosted. If it's not, it suggests a Cu-Ni coin.
I had a look because I was unfamiliar with the series of wedding crowns. The silver variety was proof finish and came in a capsule in boxed sets or singly. The fact it's in cellophane makes me think CuNi too. Get a 39 mm airtight is my suggestion, the kind you'd get for a Krugerrand or Britannia. I especially like the kind with the black foam ring on the inside. I would grasp the coin, with the cellophane sleeve cut two adjacent sides of the cellophane off then gently insert the exposed coin rim into the airtight, and gently let the coin fall in while pulling the cellophane off.
Because the diameter of the airtight you are going into is slightly larger than your coin, it should fall into place nicely. If the airtight diameter was slightly smaller, it would take a little nudge to get the coin in there, which is why I use the foam rings, there's a bit of give.
I have the copper -nickel one in one of those square yellow cases. It was cheap then and it is still cheap now. The proof that I have is in a plush green box. It has a COA that says it's silver and only 100,000 were minted for sale just in the UK. I bought it from Manfra, Tordella, and Brookes before the Twin Towers attack.
The blue cased box came with Charles and Diana and then with the 25th anniversary of the Elizabeth's rule.
A TPG would cost too much for this coin, which I bought when the dollar was worth a little someting back in 1972. Here's a picture of the little darling:
Sorry, read it as a 1977. The 72 was green. I've got a spare 72 box here, but postage from the UK might be prohibitive.