Several very knowledgeable Coin Dealers that have bought and sold many of the 1942/1-P and 1942/1-D Mercury Dimes over the years, all believed that the coin was authentic. If one of these Working Hubs was also shipped to the San Francisco Mint, then there were also similar Varieties struck at the San Francisco Mint. Since the Philadelphia Mint produces all of the Dies for the three Mints and it is highly likely that at least one or more Working Hubs (Dies) that had the overdate DDO which are found on the 1942/1-D Varities was retained by the Philadelphia Mint for minting the 1942-P Mercury Dimes. Although none of these possible new Varieties have ever been found or submitted for authentication, certification and grading before, it is a very high possiblility that the coin is authentic and others exist. This overdate DDO looked identical to the 1942/1-D Mercury Dime Varieties and Dave (the COin Dealer) also had a 1942/1-D specimen for sale and it was used for comparison. You might want to take another extra long look at your 1942-P Mercury Dimes! I attended a local Ioin Show in Knoxville, Tennessee on Saturday and one of the Coin Dealers that I know had a 1942/1-P Mercury Dime that is apparently a new variety.
