.357 Magnum. 4" barrel. SN: N559922. Blued finish, color casehardened hammer and trigger, S&W medallion faux ivory grips. Double action revolver with fixed blade front sight, frame groove rear sight, partial barrel underlug, narrow checkered hammer spur, narrow grooved trigger face and 6-chambered swing out cylinder. Originally specified and ordered by the New York State Police, the N-frame Model 520 was produced in 1980 with roughly 3,000 guns being produced which the NY State Police did not purchase. They were then sold commercially.