Description
Among the earliest chapters in the history of American semi-automatic pistols stands the groundbreaking Colt Model 1900, the first successful automatic pistol adopted for commercial production by Colt and one of the earliest practical autoloading handguns designed by John Moses Browning. The example presented here represents a remarkable and rarely encountered experimental conversion prototype, illustrating Colt’s efforts to refine the Model 1900’s distinctive and controversial “sight safety” system.
The Model 1900 introduced Browning’s innovative short-recoil operating system and was chambered in the powerful .38 Automatic Colt Pistol (.38 ACP) cartridge, a round that significantly outperformed most handgun cartridges of the era. One of the pistol’s most unusual features was the combination rear sight and manual safety, commonly referred to as the “sight safety.” When raised, the rear sight blocked the firing mechanism, functioning as a safety; when lowered, the pistol could be fired.
While ingenious, the system proved unpopular with many shooters. The small sight was difficult to manipulate and could be accidentally engaged or disengaged during handling. As Colt and Browning worked to improve the design, a number of experimental modifications were made to explore alternatives. This pistol reflects one of those transitional stages.
On this prototype, the original sight-safety mechanism has been replaced by a fixed rear sight mounted in a transverse dovetail, eliminating the pivoting safety arrangement altogether. Evidence of the earlier configuration remains in the modified slide architecture, where a filler plate was installed in the cavity previously occupied by the sight-safety mechanism. This conversion represents an early attempt to determine whether the pistol would benefit from a conventional sight arrangement rather than the dual-purpose system.
Another intriguing modification associated with this experimental configuration is the use of a bronze firing pin in place of the original steel component, an alteration believed to have been part of Browning’s evaluation of alternative materials and firing systems during the pistol’s early development.
The pistol itself reflects the pragmatic and experimental nature of early prototype work. Surviving examples show characteristics consistent with hand-assembled developmental firearms, including subtle machining variations and components drawn from different stages of Model 1900 production. Such traits offer a tangible window into the workshop environment in which Browning’s revolutionary designs were refined before evolving into later Colt automatic pistols.
Historically, these experimental pistols represent an important evolutionary step between the earliest Model 1900 pistols and the later Colt autoloading handguns that ultimately culminated in Browning’s legendary service pistols of the early twentieth century. Each surviving example provides rare insight into the iterative design process that shaped the future of semi-automatic handguns.
This Colt Model 1900 conversion prototype stands as an exceptional artifact from the dawn of the automatic pistol era, an authentic developmental piece reflecting the collaboration between Colt and John Browning as they refined one of the most influential handgun designs in history. For collectors of early Colt automatics, prototype firearms, or Browning-designed pistols, examples such as this represent the very foundation of modern handgun development.
