Proofs

Hi Collect4fun,
Every rule has its exceptions....
Almost all proofs from 1964 and earlier were from Philadelphia. There are early branch mint proofs known, such as the 1838-O half dollars from New Orleans, as well as proof 1875-S twenty-cent pieces and 1894-S dimes from San Francisco. I think there may be some authenticated Morgan dollar proofs that were made at Carson City (those would be cool!).
Modern proof sets come from San Francisco. However, other mints, especially West Point, have produced an assortment of modern commemorative proofs. The 1984 Olympic $10 gold pieces were made in proof format at SF, West Point, Denver, and Philly. The key date 1995-W proof silver eagle was made at West Point.

I understand that proofs are not a condition but a manufacturing process. So how do you tell the difference between a high grade business strike Philly coin and a Philly proof?

Of course you must note that Proofs are special made coins with a speical process. They are then entered into a plastic type holder. Same with Mint produced Mint or Uncirculated sets. If you should find a coin in circulation that was once a proof, there is a great chance it was from a stolen collection and spent as normal currency. Other times inheritances end up the same way. Once in circulation much of the surface has been damaged suffieciently to make Proofs almost worthless as a collector item. If the coin is still in the original package it should state Proof and with that you'll know.