I saw M&H features Too. Here is why--- (Around 1877, after they had gained experience in manufacturing large frame revolvers for Merwin, Hulbert & Company, Hopkins & Allen introduced their own line of large frame, single action revolvers to compete with Colt and Smith & Wesson, the two major American handgun manufacturers of the period. These guns constituted the “XL No 8” line of handguns, which included the XL Army (.44 caliber, both rimfire & WCF), XL Navy (.38 RF caliber) and XL Police (also .38 RF caliber). It is believed that a total of 2,700 of the large framed XL No 8 revolvers of all models were produced by Hopkins & Allen between 1877 and 1885. The .44 caliber Army model was available with a 4 ½”, 6” or 7 ½” barrels as standard, and was primarily chambered for .44-40 (.44 Winchester Center Fire), with a small number also produced in .44 Rimfire Henry.) I Think yours is a .44 henry rimfire by the looks of that hammer, nice find!