What I can make out from the photos is you have a very common Mercury dime dated 1943 coined at the San Francisco mint, just over 60 million were made that year at that mint location. The coin looks to grade AU possibly cleaned with some black crud on both sides, your photos of the mintmark are blurry but it might be RPM-004 but clearer photos would be needed to confirm the RPM. I would not consider it special, if confirmed the RPM while interesting is minor and adds little to nothing value wise to the coin. What I would do with it is to put it in a plastic flip and hope that silver goes way up to the point that I could sell it when melt prices peak, what you choose to do with it is your call.