What a great find! Congratulations on a great deal.
While no Remington Hammerless Double production records have been found at "The Arms" the late Charles Semmer assembled his serial number chronology for his book
Remington Double Shotguns from surviving shipping records.
Here are the 1907 Remington Arms Co. catalog pages for the B-Quality guns --
1907 Catalog pg 18 B quality guns.jpeg
1907 Catalog pg 19 B quality guns.jpeg
Your leather-faced recoil pad looks just like the one I suspect to be original on my circa 1905 DEO-Grade 16-gauge --
132280 18.JPG
I have an early BE-Grade 12-gauge that has the Chain J Damascus barrels as shown on the Remington Damascus sample.
Threaded Mode