sentences:  The .380 Pocket Hammerless overwhelmed the Pocket Hammer model's sales but the 1903 persisted, possibly because the .38 ACP was still a more powerful cartridge than the .380 ACP.However, World War I clearly slowed production and after production surged to 3,200 in 1920 (probably to fill dealer back orders built up during the war), sales became very slow and the 1903 Pocket Hammer faded out of use, while the smaller 1903 .380 and .32 ACP Pocket Hammerless pistols thrived.Only a scant handful of 1903 Pocket Hammers were used by the military, and then only as secondary arms purchased not pursuant to contract.