Manufactured from 1891 to 1911, this revolver is in the scarce Mexican Model configuration, one of the only 2,000 produced identified by the spur trigger, lack of the integral frame extensions protecting the trigger, that is found on all other S&W spur trigger models and no half cock hammer position. Many of these revolvers were shipped to Mexico, Russia and South America. The top of the barrel rib is marked two line, two block address and patent dates flanking "MODEL OF 91". The matching serial number is marked on the butt, rear cylinder face, barrel latch and barrel. Pinned blade front and notch rear sights, nickel finish with casehardened hammer and fitted with smooth ivory grips.