sentences:  This would indicate that only about 1,700 or so 1903 Pocket Hammers had the rear milled slides, making them the earliest and hardest to find of the type.Serial numbers of the 1903 Pocket Hammers started at 19999 in 1903 and went backward to 16000 into 1906.After that, serials resumed at 20000 and went up to 47227 ending in 1927 when production discontinued.