A Colt model 1903 Pocket Hammer Automatic Pistol, cal..38 rimless, no. 26649. Mirror-like bore, barrel length 4 1/2". Manufactured in 1911. 7-shot. On both sides of slide standard inscription as from 1908.
Gun Review: The Colt Model 1903 Pocket Hammerless :: Guns.com
WWI (1917) Colt 1903 Pocket Hammer Pistol | Rock Island Auction
コルトM1903 - Wikipedia
Colt 1903 Pocket Hammer .38 Special Rimless Caliber Pistol.
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1903 Colt Pocket Hammerless - SkyAboveUs
My 1919 production 1903 Pocket Hammer in .38 ACP : r/Colt