odd serial# on a 1942 longbranch.Any ideas?

[superbee]

Hi,Just picked up a 1942 dated #4 longbranch.It is like new condition.Appears unfired.
A few things seem odd.
Rifle is completely parkerized.Looks just like my 1950.
barrel is dated 1952.Canadian arsenal marked.
MK3 back sight.Only part that is blued.
Serial# has been ground off and replaced with 10Jxx.Same for bolt.
Front band and middle band Canadian Arsenal marked.All other parts LB marked.
New walnut stock.Clear C broad arrows and LB marked.Looks original.Not sanded or refinished.
A check piece has been added that matches in color and texture.Same finish as rest of stock. Looks like factory installed.
Target swivel added.Also parkerized.

Is this a post war factory rebuild?For a specfic contract?would this explain the odd serial#?
Like to know all your "expert" opinions.

Cheers,Eric

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