This thread is simply to inquire how this error is possible. I tried to find the answer through google, but came up empty. Clearly, coins are minted at san fransisco, denver, or philly, and I'm confused why dies at these mints would have more than one mint mark to begin with? Was it an error caused by the creator of the dies, or was the mint mark punched in at the mint? Any info would be interesting. Thanks, Zane
Easy - the mint mark was always puched into the die by hand. And it was not done until the dies were distributed to the various mints. So let's say Denver breaks the last of their cent dies for a given year and they still need to strike more coins. They ask San Francisco if they have any left over dies - they do - and they are shipped to Denver. Now the SF dies already have the S mint mark punched into them - so when they arrive at Denver - a D mint mark is punched into the die right over top of the S. Same story for all OMM's
