Drew,

That is much more info than I dug up yesterday. I had made the Kirtland connection, but had not pinned down many dates. The 16ga Hammergun on the GB listing is now mine. I should have it by next week. What got my attention is the stock profile being the late style I call Savage vs the earlier Stevens stocks. It follows the same lines as the Utica mfg'd Fox Sterlingworth. If so this should put Warner Arms Corp. still in operation after 1930. ???

There is another Fulton model, ser# 21xxx with the "WARNER ARMS CORPORATION" label listed on GB now. It is the same variant as the one pictured above. Stock looks like the ad copy you posted.

https://www.gunbroker.com/item/817117949

Lots of riddles in the gun business,

Thank you Drew,

John