Harrington & Richardson (H&R) Model 158 Single Shot Shotgun

This item is the receiver and frame assembly of a Harrington & Richardson, Inc. single-shot shotgun, manufactured in Gardner, Massachusetts. The firearm features a case-hardened steel finish that exhibits a significant amount of mottling, surface oxidation, and a dark brown patina indicative of heavy use and age. Visible markings stamped into the left side of the receiver include 'HARRINGTON & RICHARDSON, INC.', 'GARDNER, MASS. MADE IN U.S.A.', along with 'U.S. PATENT NO. 3988848' and serial number 'BA559528'. The patent number refers to a specific firing pin assembly and safety mechanism utilized in mid-20th-century H&R break-action designs. Structurally, the receiver shows signs of wear, particularly around the pin locations and the edges of the metal frame. The trigger guard is finished in a standard black coat which also shows light scratching. There are clear signs of surface corrosion and some pitting, particularly toward the top of the receiver near the barrel junction. Based on the manufacturer's location and the serial number prefix, this piece likely dates from the 1970s. The craftsmanship is typical of utilitarian American-made sporting arms of the period, designed for durability and functionality rather than aesthetic refinement.