Model 1900 shotgun markings

[Researcher]

Both of my Model 1900s have an extra four digit number (1909 16-ga 4651 and 1906 12-ga 2822), which Charles Semmer who wrote the book, Remington Double Shotguns has referred to as a factory assembly number. I don't believe anyone still alive knows the meaning of the codes on the bottom of the barrels of Remington Hammerless Double Barrel Shotguns.

I've posted this information before, add these to what is in Charles' book and the markings you have, maybe a pattern will emerge?!?

1906 12-gauge KE-Grade has /// K E Y

1907 12-gauge KE-Grade has L K E Y

1909 16-gauge KE-Grade has X K E A1

1896 12-gauge AE-Grade has P A

1906 12-gauge FE Trap has /// F E G 13

1895 12-gauge BE-Grade has B J and a poorly struck E or an F

1907 CEO-Grade 12-gauge has /// M

1905 DEO-Grade 16-gauge has X O

In some cases you can get the grade as in the KE and FE. My BE-Grade has Chain Damascus barrels, and on the Remington Damascus salesman sample the Chain Damascus is labeled CHAIN J. So, B for the grade, J for the barrel material and E for ejectors?!? Hmmm....

Just from looking at my little list there seems to be a difference in the markings on the early guns, 1895 and 1896 and those from the later years 1905 to 1909. Anyone willing to share marks on 1897 to 1904 guns? I also noted that in my later guns both 16-gauges have an X and several of the 12-gauges have ///. I see Semmer shows the barrels of 12-gauge KE-Grade 361550 and it has the same /// K E Y as my slightly earlier 12-Gauge KE-Grade.