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You will note that the import mark say "MK5" NOT No5 so that is incorrect.
The action scallops look Kosher.
Some No5s were fitted with an end cap, some weren't and some that were had them removed when the wood rotted due to collecting moisture under the end-cap
The screw in front of the magazine looks like an Indian addition (called the Ishapore Screw) so it may have served in India.
The Bayonet looks like an Indian Copy of the No5 bayonet.
Another indication of Indian use is the original manufacturers marking seem to have been ground off (the CAI markings are where the original manufacturers markings should be)
There is not enough detail in the pictures to see any markings, but, the above commebts are based on what I can see.
And that is why you bring it here! Based upon that, it sounds like an Indian copy where they ground off the No 4 stampings?