Interesting Electro Pencil Markings on No4 Mk1(T)

[CoatiMundi]

Recently when I was doing some work on my No4 Mk1(T), I removed the trigger guard assembly and I found this Electro Penciled on the bottom of the receiver between the ears for the rear screw. It appears to say "DL WN DAVID JG 535 M.S".
I'm curious if anyone has seen this type of marking of receivers while these rifles were in service or maybe recognizes if this as a military unit, etc.

This rifle was heavily sporterised previously so it could just be from someone who owned it after being surplussed.

Either way, I thought I would share it and see what the group thinks.

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