This extremely rare model is quite similar in appearance to 3rd Model Single-Action. Notable differences are flat hammer sides, with no outward flaring of spur. Spur trigger assembly was not made integrally with the frame, but a separate part added to it. One must exercise extreme caution as S&W offered a kit that would convert the triggerguard assembly of Third Model to spur trigger of Mexican Model. This, coupled with the fact that both models fall within the same serial range, can present a real identification problem. Another feature of Mexican Model is absence of a half cock. The exact number of Mexican Models manufactured between 1891 and 1911 is unknown but estimated that the number is about 2,000.