S&M????!!!!
I knew S&M involved whips and chains, but revolvers?
But seriously folks, after I read this thread a got my Model 10 out of the safe and looked at it and I guess if you squint a little the W could look like M. Or maybe the guy who stamped all the lettering on the OP's gun was, hmmmmm, not dyslexic but whatever it is to see upside down all the time?