After looking at it, I realized the 3" / 76mm chambers were done well BEFORE the last proof.
This gun was reproofed at least twice, as shows the two different "Crown over R" stamps.
I can see it has Crown over BP (being the "proof" mark) and crown over BV (being the "view" mark) which dates it from 1904 - 1954 period, while the two 18.6 and "Crown over BNP" are post '54 (and there's two of them...). The NITRO-PROOF 1 1/2 (no other unit marks, like Oz), is correct for the 1904-1925 period.
The 12 / LC is post 1904 and is correct for a "over 3" chamber" and 12 / "C" would be for a "standard" chamber and these goes with the proofmarks. After 1904, the long chambers needed to be stamped 12 / LC and declared (mandatory) as long chambers and they were proofed with 1/6 more powder proof charge.
The 850 bar is correct for the post 1989 era... so, you have the picture..
There's a lot of history on this shotgun.
This gun was reproofed at least twice, as shows the two different "Crown over R" stamps.
I can see it has Crown over BP (being the "proof" mark) and crown over BV (being the "view" mark) which dates it from 1904 - 1954 period, while the two 18.6 and "Crown over BNP" are post '54 (and there's two of them...). The NITRO-PROOF 1 1/2 (no other unit marks, like Oz), is correct for the 1904-1925 period.
The 12 / LC is post 1904 and is correct for a "over 3" chamber" and 12 / "C" would be for a "standard" chamber and these goes with the proofmarks. After 1904, the long chambers needed to be stamped 12 / LC and declared (mandatory) as long chambers and they were proofed with 1/6 more powder proof charge.
The 850 bar is correct for the post 1989 era... so, you have the picture..
There's a lot of history on this shotgun.
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