Went thru the pile of saws at the Habitat store yesterday. I had ignored this (meat) saw earlier, but pulled it out to look it over. The stamp is H & C Disston, over Phila. Warranted. OK a Disston, father and son stamp? The Keystone stamp is a bit blurred and slightly off center, hand stamped? Handle is definitely for 3 fingers, and never modified. The frame is one piece, and the front with hole for the pin is definitely hand forged. Thought it was rather interesting, especially for the price. I have known this type as a butchers saw, but am wondering with its age if it wasn't an early hacksaw?