The first small-frame Harrington & Richardson single barrel was the Model 1905 --



which took down by means of a removable hinge pin. My .44 Caliber --





The Model 1905 was a scaled down version of the H & R Model 1900. H & R redesigned their larger gun to take-down by means of a snap-on/-off forearm and introduced it is the Model 1908. Then in 1915 they did the same to the little gun and called it the Model 1915 --