No.
Who would commit such a dastardly act?
Peter, please explain.
Paul
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If it was with a unit any time after about 1987 then it would have been shoved horizontally in a rack designed for SA80 - which would be a good reason to have the number in a visible location on the top of the butt.
Another possibility is that if the rifle has a target rail fitted, then it would have been used on a firing point with a a small target bipod/stand fitted. Schools and units with a number of identical rifles do tend to paint or stamp identifying marks on them to differentiate the rifles on the firing point.
It's a funny old world - I met the new owner of this L39A1 yesterday at the Big Reno Show - he had the rifle with him (not for sale, though) and I recognized it because of the mark in the right side of the forend near the magazine well. He has been collecting Lee Enfields for decades and was a jolly nice bloke. He did have a 1955 UF series No.4 Mk.2 in the wrap for sale, but I couldn't afford the $1100 he was asking (makes me want to sell mine for a thousand lol).