Dating birmingham proof marks

Markings on gun barrels and other gun components that indicate the level of pressure, calibre and standards that a weapon is fit for in service. The drawings vary in style due to differences in the original information. Most are black silhouettes, but some of those that have been produced from photographs have a quasi 3 dimensional appearance that requires the onlooker to imagine that the light source is in the top left hand corner of the screen. De bossed or panelled marks show the depression in grey, with the original metal surface shown white or transparent if shown against a grid. The proof certificate is in Spanish, but the dimensions and tolerances are recognisable. Where possible the drawings will be presented against a gridded background as shown at right.
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Birmingham Proof House - Wikipedia

Admin , Global Mod , Mod. Max Online: There are several online sources for listing proof mark dates out of Birmingham. I noticed they stop at and start up at Where were guns proofed during ? I understand it was during war time efforts, but guns were still being made, sold and put into service.
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Proof is the compulsory and statutory testing of every new shotgun or other small arm before sale, to ensure so far as is practicable, its safety in the hands of the user. Reproof is the similar testing of a small arm which has previously been proved. Both necessarily involve the firing through the barrel of a considerably heavier load than is customary in the shooting field, thereby setting up pressure and stress on barrel and action much in excess of the pressure generated by standard load cartridges. Such pressure should, and is intended, to disclose weakness in guns, whether new or used. For it is preferable that weakness be found at a Proof House rather than in the field, where personal injury may result.
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The building was designed by John Horton and consists of a centre bay, emphasised by a segmental parapet, which contains trophies by William Hollins. A Jacobean-style gateway was added in The Proof House was established in by an act of Parliament at the request—and expense—of the then prosperous Birmingham Gun Trade. Its remit was to provide a testing and certification service for firearms in order to prove their quality of construction, particularly in terms of the resistance of barrels to explosion under firing conditions. Such testing prior to sale or transfer of firearms is made mandatory by the Gun Barrel Proof Act of , which made it an offence to sell, offer for sale, transfer, export or pawn an unproofed firearm, with certain exceptions for military organisations.
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