Designed by engineer Alejandro Obregon for the Mexican Army, it is believed that less than 1,000 of these pistols were manufactured in Mexico c. 1934-1938, with only a very small fraction of surviving examples known to be in circulation on the collectors market today. This example offered, serial number A100, appears to be the 100th production example. The Obregon pistol was intended to be a home-grown alternative to the Colt Government Model. The Mexican Army decided to remain with the Colt pistol, and production of the Obregon came to a halt. While the Obregon shares some visual similarities with the Colt Model 1911A1, it is mechanically different. The barrel rotates to lock instead of moving vertically, with a combination safety switch/slide catch. Some other known examples have are equipped with a magazine well safety that prevents the hammer falling when the magazine is out, although this example does not appear to have a functioning magazine well safety. The left side of the slide is marked "Sistema OBREGON/Calibre 11.43" (.45 ACP), the right side of the frame is marked "FABRICA DE ARMAS MEXICO/No A 100" and "PAT.No. 35053". It features low profile fixed sights, a grip safety, serrated trigger, knurled wide spur hammer, serrated front grip strap, arched serrated mainspring housing, a provision for a lanyard ring (absent) on the butt, checkered walnut grips, and an unmarked blued magazine.

Fine, retains 60% arsenal refurbished blue finish with wear areas faded to smooth brown and gray patina on the balance. Grips are very good with scattered nicks and handling marks. Absent lower screw on the right grip panel. The magazine catch is weak, magazine does not stay properly retained, otherwise mechanically functions.