Brittish Proof
Back
London proof in context
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Period
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Marks
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Pre 1813
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May be together with private makers marks and stamps.
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1813-55
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1855-68
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12
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First period where caliber is marked. Normally plaved between Viewmark and Definitive proof mark.
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1868-75
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or
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12
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1875-87
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or
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or
12
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1887-96
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or
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CHOKE
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1896-1904
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or
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NITRO PROOF 1 1/8 oz Max
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CHOKE
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1904-25
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or
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NITRO PROOF 1 1/8 or 1 1/4 oz
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2 1/2”
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CHOKE
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1925-54
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NITRO PROOF 1 1/8 oz Shot
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CHOKE
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1954-89
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3 Tons
900 kg
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.729
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2 1/2”
65 mm
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1989-2005
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65 mm
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850 bar
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18,5 mm
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2005->
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LINED
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CIP Steel symbol
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Supplementary Proof at 1200
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Ordinary proof at 850
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Addition to sleeved since this new mark is a update to current technology
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Last updated: 2009-12-05
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