Маркировка испытаний 1813-2006 гг.

On o/u barrels some marks will normally be found on or near the flats and those for the upper barrel on one or other side of it. The precise sequence of marks will not necessarily be as set out below. Some of these marks are to be found on the action table either in addition to or instead of those on the barrels.

Лондонские испытательные клейма [url]http://www.gunproofmarks.ru/[/url] Pre 1813
The London marks may be accompanied by private makers' marks, those for Birmingham will be unofficial private proof and makers marks.

Лондонские испытательные клейма [url]http://www.gunproofmarks.ru/[/url] 1813 - 1855
The London provisional mark was introduced at some point during this proof period but even the Proof House cannot be sure precisely when at this distance in time.

Лондонские испытательные клейма [url]http://www.gunproofmarks.ru/[/url] 1855 - 1868
This was the first proof period when the bore/gauge size of the weapon was marked and was normally placed between the definitive and view marks. It was also the first time that a provisional proof mark was specified for Birmingham.

Лондонские испытательные клейма [url]http://www.gunproofmarks.ru/[/url] 1868 - 1875
Alternative provisional marks for both proof houses were introduced where barrels were proved in the state for definitive proof rather than at the initial stage. When this alternative mark was used the normal provisional proof mark was omitted.

Лондонские испытательные клейма [url]http://www.gunproofmarks.ru/[/url] 1875 - 1887
With choke boring by constriction in its infancy and such barrels not necessarily being capable of dealing with solid ball ammunition, the breech and muzzle measurements were stated and the fact that the weapon was unsuitable for use with ball. Recess choking, where the breech and muzzle were of the same size but enlargement just before the muzzle gave an alternative form of choking, was marked slightly differently by a similar size measurement followed by the work CHOKE, e.g. 12B/12M CHOKE although occasionally the muzzle measurement has been seen as 13M. Where there was no choking of either kind these breech and muzzle measurement marks were omitted.

Лондонские испытательные клейма [url]http://www.gunproofmarks.ru/[/url] 1887 - 1896
This was the first period that fractional gauge sizes were marked between 12/2 (.740), 12 (.729), 13/1 (.719) and 13 (.710) in respect of 12 gauge guns. The word CHOKE was first used to indicate its presence and to distinguish the correct nominal size of the weapon and its ammunition, the diamond mark was introduced. When this latter mark included the initials LC instead of just the appropriate gauge size and the initial С it indicated a long chamber of at least 3 inches. At this period if the initial С was omitted altogether it indicated a chamberless gun.

Лондонские испытательные клейма [url]http://www.gunproofmarks.ru/[/url] 1896 - 1904
For the first time the words Nitro Proof were used with the highest service load. All previous proof denoted Black Powder only, unless since 1887 one of the special powder proofs were stamped in which case the maximum service shot and powder loads were stamped.

Лондонские испытательные клейма [url]http://www.gunproofmarks.ru/[/url] 1904 - 1925
Whereas London merely added their own additional stamp to denote nitro proof, the Birmingham Proof House used a new range of stamps and discontinued the crossed sceptre mark. Birmingham introduced their private viewers date stamps from 1921.

Лондонские испытательные клейма [url]http://www.gunproofmarks.ru/[/url] 1925 - 1954
The actual length of chamber at the time of proof was stamped for the first time. Any subsequent enlargement e.g. 2½ inches to 2¾ inches renders the weapon out of proof until reproved. During this period guns made outside UK but proved here had the British marks encircled and the words 'Not English Make' additionally stamped. The reproof mark was first introduced at this time.

Лондонские испытательные клейма [url]http://www.gunproofmarks.ru/[/url] 1954 - 1989
After 1955 the chamber stamp was optionally in metric, e.g. 65 mm (2½ inches) or 70mm (2¾ inches). The gauge size is now shown as a decimal part of an inch although .729 became .728 from 1986. All proof being nitro unless otherwise stated the new service pressure was stated in tons. Only Birmingham used the per □" addition and then only until 1984. Where optional metric proof was stamped after 1984 it designated proof rather than service pressure (900/1200kg). London introduced date stamps from 1972. The diamond mark lost its C.

Лондонские испытательные клейма [url]http://www.gunproofmarks.ru/[/url] 1989 - 2006
The diamond surrounding the nominal bore size became optional, London tend to keep it and Birmingham to drop it. Barrel sizes are now all metric 18.5mm (instead of .728 inch) as are chamber sizes 65/70 mm (instead of 2½ inches/2¾ inches). Proof pressure rather than service pressure is measured in 850 Bar (instead of 3 tons/2½ inches) or 1200 Bar (instead of 3¼ tons/2¾ inches) Magnum proof is so marked.

Лондонские испытательные клейма [url]http://www.gunproofmarks.ru/[/url] 2006 -
The proposed new Rules of Proof for 2006 merely stamp for Standard or Superior proof (850 or 1200 Bar) indicated by the appropriate new mark with either one or two crowns. Magnum/Special Definitive proof is retained for special heavy loadings. An additional steel shot mark is introduced for those requesting it and lined barrels as well as sleeved ones will be appropriately stamped. The Birmingham date stamps will be changing as described earlier during 2006 or when the rules become operative if later.