It is estimated that only 200 to 300 of these pistols were manufactured in .38 Rimfire by the Rollin White Arms Co. from 1861 to 1864, making them scarce even when compared to their rare counterparts chambered in .32 rimfire, of which about 3,000 were manufactured. Rollin White is of course famous for his patent on bored through cylinders which he granted Smith & Wesson the exclusive rights to manufacture. This example is numbered "64" on various parts, some of which are accompanied by a perpendicular "1", including the grips. The right side of the frame is marked "B.KITTREDGE&CO/CIN.O." It features the unique swivel out breech with an ejector as well as blade and notch sights.