There were 1,000 of the S&W M&P Model 1899's and another 1,000 Model 1902's purchased by the US Navy. I have one of the oder 1899's myself and I have seen a Model 1902 with numbers stamped on the Backsgrap. I have seen some people say they are rack numbers for the arsenal on the ship or station. Is that really what they are, or are they the ship number? Such as BB-1 USS Indianapolis, or PG-42 USS Villalobos, or other ship numbers? I am sure there are some Navy guys out there who know exactly what they are. Also is there any way to know what ship or station post they may have been assig