Lithgow Knox marking numbers question

[RDSMB]

Hello, this is my first post concerning my Lithgow No.1 Mk III*
I have found much info on my rifle here, but I am not clear about the numbers on the knox. It seems to me that it was re barreled possibly?
The date stamped on the receiver is 1942 and 1941 on the butt stock.
See the attached photos.
Any help would be appreciated.
Thanks, Richard

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