The sponge rubber pad was patented by S.A. Huntley, Patent No. 1,222,291, granted Apr. 10, 1917, and assigned to Huntley Manufacturing Company of Omaha, Nebraska, a corporation of Nebraska. They manufactured the pad briefly before WW-I. I have not been able to determin exactly when Jostam acquired the rights and began manufacturing the Jostam Sponge Rubber Pad. The patent application for the Jostam Hy-Gun Pad, was filed May 21, 1926, and Patent No. 1,642,835 was granted Sept. 20, 1927. So, a Hy-Gun wouldn't be age appropriate to the gun in quesion. An original Silvers, or a Jostam Anti-Flinch would be age appropriate to the gun. Jostam continued manufacturing their line of pads into at least 1949, maybe later. NOS Jostam pads show up on ebay fromtime to time.
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