I picked this up a while back for no other reason than it interested me. This is a "J Stevens Arms Company" marked model 5100. These 2 marks would date the gun as manufactured between mid 1936 and 1940 by my research. On the side of the receiver is the "U S" and the flaming bomb which appear to be authentic early wartime. The butt pad has been replaced as the fit is not perfect. According to my web research the gun shipped with an "Anti Flinch" marked pad. Barrels are marked: "Proof Tested 2-3/4 Inch Chambers" on the left barrel and "Selected Forged Steel" on the right. There are no choke designations marked. Other than what is shown there appear to be no other US ordinance marks.
From my reading, early in 1942 the government was asking for donations of privately owned firearms and also buying guns off retailer's shelves. Would either of these situations match the markings? Also, this was in the pre serial number time.
Thanks for any observations.