The Philadelphia issue comes in second, and surprisingly, the New Orleans isseu is the most common of the trio until MS64. In full gem, the Philadelpiha issue is more common becuase more coins from that Mint were saved by collectors who bought them at the Mint or at ..... I had narrowed the choices dwon at one point to Roman Imperial coins and US coins. Being a sort of history geek and, with a longlived itnerest in anything from the United Sattes, I choose the latter. ...