Ruger Speed-Six documented as so when sent to San Francisco Sheriff's Department, by Strum-Ruger but marked as Police Security-Six. It has a round butt, like any other Speed-Six, but the wrong name. Anyway the Ruger letter that proves it, comes with the revolver. I have harbored this handgun like a lost child, but now it must go. It is very accurate, with hand-loads especially. It is in excellent shape inside and out. Little used but greatly appreciated. $375 cash. No trades. Sold pending funds.