Odd SMLE Butt Stock

[Torandir]

Hi All,
Doing some restorations on a couple of No1 Mk3 sporters, and I decided to swap the rather sanded and repaired butt off of a canadian marked 1916 LSA marked one. (Purely for shooting purposes) Interestingly there appears to be some kind of serial number on the wood that goes inside the socket, but it does not match the serial of the rifle. I've also never seen a serial on the butt like this before so i/m not entirely sure what it is.
Photo:
https://photos.app.goo.gl/kK1xrDAy7phesLxm6
Any info is appreciated.

 

[Pblatzz]

Looks like old wood, stained time, blood, mud, sand, and oil. It's likely seen a world we can only imagine. A full picture would be nice to see what has been altered and if there are regt markings.

Often CDN wood is dark, well used, and repaired. The number could be the rifle serial number of manf marking.

 

[#4mk1(T)]

No.4Mk.1(T) rifles have the rifles serial number market along the top of the socket but I’ve never seen this done on a No.1.
This one appears to be done down the side if I’m seeing the picture correctly as well. Perhaps a unit armorers idea to keep parts marcher to their respective rifles during maintenance.