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[It did have a hammer](http://en.wikipedia.org/wiki/Colt_Model_1903_Pocket_Hammerless).
> Despite the title ‘Hammerless’, the Model 1903 does have a hammer. It is covered and hidden from view under the rear of the slide.
Otherwise, modern ‘hammerless’ pistols are usually [striker-fired](http://en.wikipedia.org/wiki/Firing_pin#Striker_construction) designs.