There isn't one. However, I can tell you that it's from California. It's a San Francisco mint. That mint isn't generally stamped on the coin. Thank you for your interest and for bidding.
As far as I could tell, there wasn't one. It's an unmarked mint penny, so, it may very well be from the San Francisco mint. The reason that I said that is because not all pennies from San Francisco are marked. I'm pretty sure that it's from California.