An early Colt Model 1900 experimental conversion prototype chambered in .38 ACP. This example is described with a fixed dovetailed rear sight replacing the original “sight safety” setup, along with a bronze firing pin and other developmental features tied to the evolution of Browning’s early autoloading pistol design.
The Colt Model 1900 stands at the beginning of Colt’s commercial semi-automatic pistol production and among the earliest practical autoloading handgun designs by John Moses Browning. This example is described as an experimental conversion prototype centered on the Model 1900’s distinctive “sight safety” system.
Chambered in .38 Automatic Colt Pistol (.38 ACP), the Model 1900 introduced Browning’s short-recoil operating system and originally used a combination rear sight and manual safety. In that arrangement, the rear sight could be raised to block the firing mechanism and lowered to allow firing.
According to the provided description, this pistol reflects a transitional effort to revise that system. The original sight-safety arrangement has been replaced with a fixed rear sight mounted in a transverse dovetail, and the slide shows a filler plate in the area formerly occupied by the earlier mechanism.
Another noted modification is a bronze firing pin in place of the original steel component. The pistol is also described as showing characteristics associated with hand-assembled developmental work, including subtle machining variations and parts drawn from different stages of Model 1900 production.
As presented, this Colt Model 1900 conversion prototype offers a close look at an early stage in the refinement of Browning’s autoloading pistol designs and the development path that led to later Colt semi-automatic handguns.
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