This is a pic of a Proof with cameo and all, 1962 beauty, excuse the pics. On ebay sometimes you see the names used interchangeably Proof or Mint sets. My understanding has been that there's a difference between the two. I understood it to mean that Mint sets have always been available for sale. Then in the early 60's the US mint came up with Proof sets which were made for collectors. Can someone clear up my information? It gets a bit more confusing b/c I have bought mint sets off of ebay and elsewhere, sealed mint sets and I have never come across a cameo'd coin. The pic is of a half dollar I bought by itself off of ebay. What year did the US mint start minting proof sets? As always, I appreciate responses, any and all.