Colt/Ehlers Pocket Model Paterson Revolver No 1 (also known as "Baby Paterson" or "Fourth Model Ehlers") manufactured by John Ehlers c. 1840-1843 following the bankruptcy of Samuel Colt's Patent Arms Manufacturing Company using Colt Paterson components. The diminutive Baby Paterson/Fourth Model Ehlers revolver is the smallest Colt percussion revolver. This revolver has the distinctive Ehlers features which include: (1) attached loading lever with retaining spring, (2) capping channel in the right recoil shield and (3) rounded cylinder rear. The cylinder back has ratchet teeth and lacks the cylinder turning ring found on early Colt Paterson revolvers. In addition, the top of the barrel is roll-stamped with the legend "Patent Arms Paterson. N.J.-Colt's Pt.." which eliminates the "M'g Co." marking found on Colt Paterson revolvers. The five-shot cylinder is roll-engraved with the "Centaur Scene" and the "Colt" four horse-head trademark. The serial number, "37" is visible on the inside of the barrel lug and rear face of the cylinder when the revolver is disassembled. The hammer spur has borderless hand-knurling. The revolver barrel, frame and cylinder have a high polish blue finish. The loading lever and hammer are color casehardened. The walnut grip has a beveled butt and varnish finish. The Ehlers Model Paterson revolver is a rare variation of the rare and very desirable Colt Baby Paterson revolver. John Ehlers is believed to have manufactured and assembled approximately 500 Fourth and Fifth Model Ehlers revolvers utilizing components of the Colt Paterson acquired after the bankruptcy of the Colt Patent Arms Manufacturing Company. The Ehlers Model Paterson revolvers are key pieces in the development of the Colt percussion revolver.