Manufactured in the 1960s, the "S" prefix Ithaca Model 37 shotguns were intended to supplement the U.S. government's then-dwindling stockpile of WWII-surplus riot and trench shotguns, which were in high demand in the jungles of Vietnam. Single brass bead sight, with "CYL." choke marking and 2 3/4 inch chamber. "P" stamps are present on top of the chamber and receiver, with matching numbers on the barrel and front of receiver, and "U.S." on the right side of the receiver. Fitted with a 16-groove forearm and smooth pistol grip stock, which has a serrated buttplate and a 14 inch length of pull.