The letters on either side indicate the year is was converted to civilian use and the bottom number is the Inspector’s Number. Proof added when it was passed to commercial gun trade. The Crown/BNP is the Nitro Proof used by Birmingham at the time the gun was madeĥ. The crossed flags proof stamp is added only after a proof cartridge consisting of considerably more pressure has been fired and the part is found to have passed.Ģ. The stamp for King George VI was used from 1937 through 1952. The letters "GR" indicate King Georgius Rex or King George VI and the letter "P" indicates proof for land service weapons. The set of crossed flags and consists of a crown over the letters "GR" at the top and the letter "P" at the bottom of the crossed flags. The "arrow" indicates that this part has met the manufacturing standards of Great Britain and has been accepted for service. The number indicates the year of manufacture. The top of the barrel also has a significant proof mark.
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