I just bought my first S&W. The top strap is marked UNITED STATES PROPERTY. By the lanyard there is a W B and a flaming bomb. The barrel, cylinder and frame have matching #s.(911015). On the back strap there is an N Z and some more #s that don't match anything (3 66 7). Lastly there is a very very light mark under the barrel that I cann't read. I am new to the .38 S&W. Can you use .38 spl. dies for reloading? Any reloading help you be great.