With that SN, the model was actually called the S&W ".357 MAGNUM". Then it was renamed the model 27 in 1957. Your gun is well thought of in the S&W community. Unless someone knows S&Ws, they may not know, but that era was some of the finest S&W revolvers ever made. Every 5 screw I've had (a good 1 or 2
) has been fabulotastic!