Need help with ID of Eastern Arms Co .410

[Riss]

I have an older single shot Eastern Arms Co. .410 shotgun. Break open with a shell ejector. On the barrel is a circle with a large S and a P and T(?) inside the S. I assume this is to show smokeless proof test. It is in the serial number #693xx D range. Any help identifying it and its age would be greatly appreciated.

 

[SDC]

Stevens used "Eastern Arms Company" as a trade-name beginning in the mid-to-late 1920s; I can find reference to a "1929" single-shot, but nothing else, sorry.