Cartouche / Stamp ?

[MK111]

I assume that is United States Property on the reciever and barrel with the serial number.
If so it's a Lend-Lease to Britian during WW11. There was 42,000 rifles supplied. Your serial number in the 19,000 range was in the 3rd contract dated 3-27-42.
The British Proofs were installed when the rifle was supplied the civilian use.
Frank

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[browningautorifle]

I assume that is United States Property on the reciever and barrel with the serial number.

I don't see any US proofs anywhere, or mention of them...

[MK111]

I don't see any US proofs anywhere, or mention of them...

In the 4th picture you can read most of the United States on the reciever. Nothing was mentioned about US Proofs.
The rifle is a WW11 Lend-Lease to England. The British Proofs are installed after the British Military turn the rifles over for civilian use. The British Military didn't Proof Military rifles per-say.
Frank