Paper in Enfield

[Rball]

Hello, I'm new to the forum and just got a Lee Enfield no.4 MK.1 you can see the post here.

This may be the wrong forum sorry if it is.

I took off the buttplate and a paper flew out.

From what I can make out it reads:
Sam Jackson
Pluline (smudged word)
no 647xxxxx
(smudged word, looks like it might say serial) 419xxxxxxx

The pluline might be something else not sure though, the paper is pretty smudged.
The 55 might be a 22 not sure.

Any ideas what this might be?

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