The Colt Model 1907 Military pistol represents one of the most pivotal moments in American firearms history—the birth of the legendary .45 ACP cartridge and the evolutionary step that led directly to the iconic M1911.
Serial number 15 is one of only 205 ever manufactured and just 66 known to survive today. Produced in early 1908 for U.S. Army field trials, this pistol was among 200 delivered to Springfield Armory in March 1908 for testing with cavalry units.
The Model 1907 introduced several features that would become standard on the M1911: the spur hammer design, modified ejection port, externally visible chamber indicator, and the distinctive grip safety with spur. The inspector’s initials “K.M.” (Major Kenneth Morton) on the trigger guard bow confirm this pistol’s participation in the official trials process.
Serial number 15 is one of only 205 ever manufactured and just 66 known to survive today. Produced in early 1908 for U.S. Army field trials, this pistol was among 200 delivered to Springfield Armory in March 1908 for testing with cavalry units.

POTD: Colt Model 1907 Military #15 - Birth of the .45 ACP
Welcome to today’s Photo of the Day! This Colt Model 1907 Military pistol represents one of the most pivotal moments in American firearms history
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The Model 1907 introduced several features that would become standard on the M1911: the spur hammer design, modified ejection port, externally visible chamber indicator, and the distinctive grip safety with spur. The inspector’s initials “K.M.” (Major Kenneth Morton) on the trigger guard bow confirm this pistol’s participation in the official trials process.