Silver Proof

Is there a silver proof edition quarter with mint stamps other than SanFrancisco?

If so are they more valuable? I have a 2005 california statehood quarter that appears to be silver proof but is minted with a "P" stamp on it and not an "S". Did such minting take place? because I can't find any evidence.

In addition to what Bill has suggested (and is the most likely cause) there is another possibility, if the edge of the coin isn't showing any copper.

The coin blanks are made out of three layers: a core that's pure copper, and outer layers that are 25% nickel, 75% copper. Each of the layers is about a third the thickness of the coin.

The metal comes in giant rolls, and the coin blanks are punched out of the roll. The punches that create the blanks usually "pull" some of the top layer down over the edge of the copper, and then some of the copper over the edge of the bottom layer. If it pulls enough metal, the cupronickel top layer covers the copper, which doesn't get pulled down, and the edge of the coin ends up being silver-colored.

Find Popular Silver Proof At eBay Below:

List Of Recently Purchased Silver Proof:

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