The .44 rimfire series was introduced in 1875, and, per "The Official Records of the Colt Single Action Army Revolver, 1873-1895," they were serial numbered in their own range from 1 to 1897. The total production number amounted to 1,904 revolvers due to some of these revolvers being numbered within the regular centerfire serial number range, likely accidentally. Factory records for 224 of these revolvers are missing, and they may have been scrapped or not completed. Some were also converted to .22 rimfire. Schuyler, Hartley & Graham (Hartley & Graham) purchased 621 of these revolvers, the largest number of any dealer by far. Surviving .44 Henry Single Action Army revolvers are very scarce, and examples with both retailer engraving and considerable finish remaining are nearly unheard of. These revolvers would have made excellent sidearms for men armed with the popular Henry and Winchester Model 1866 lever action rifles much like the "Frontier Six Shooter" Colt Single Action Army revolvers in .44-40 were often paired with the Winchester Model 1873s. The factory letter lists this revolver in .44 rimfire with a 7 1/2 inch barrel, blue finish, and wood grips when it was part of a shipment of five guns of this type on January 21, 1880, to legendary dealers Hartley & Graham of New York City. Famous 19th century firearms engraver L.D. Nimschke engraved many revolvers for the firm. The revolver has extensive scroll engraving with beaded backgrounds, wavy line designs and borders, "Nimschke stars" on the sides of the frame by the arbor pin and on the trigger guard, checker board and dot designs on the trigger guard shoulders, and floral/fan designs on the sides of the back strap at the top. The engraving has definite similarities with the Nimschke engraved Colt from c. 1876 shown on page xxxix of "L.D. Nimschke: Firearms Engraver" by Wilson. The top of the barrel has the one-line "COLT'S PT. F.A. MFG. Co HARTFORD CT. U.S.A." address. Small "44" caliber marking on the bottom of the barrel. The left side of the frame has the three-line pattern marking in an oval panel. The left side of the trigger guard has the "44 CAL" marking. Matching serial numbers are visible on the frame, trigger guard, and butt. The loading gate has assembly number "127." The hammer has the distinctive rimfire firing pin, and the frame has the corresponding firing pin slit rather than the round hole seen on the centerfire revolvers. It is fitted with a pair of pearl grips with the matching serial number marked on the insides.