The 12-pounder QF 12 cwt naval gun is a 3-inch (76 mm) multi-purpose gun built by the British from the 1890s.
Designed to equip the Royal Navy's "27-knot" destroyers, it also equipped several armed trawlers and served as coastal artillery.
It was then purchased and produced under the name of 76.2 mm/40 Type 41 gun by Japan, which made it the standard secondary armament of its ships between 1890 and 1920. Italy bought and produced them under license by Ansaldo; they were used for anti-aircraft defence during the Second World War.
http://www.navweaps.com/Weapons/WNBR_3-40_mk1.php
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QF 12 pounder 12 cwt naval gun (serial #11107), CPP 1943. The QF 12 pounder 12 cwt was a 3-inch (76 mm) multipurpose naval gun introduced in 1894 and used until the mid-20th century. It was produced by Armstrong Whitworth, Elswick in England for use on warships, and exported to Allied countries.
In British service, "12 pounder" was a round reference to the weight of the projectile and "12 cwt" referred to the weight of the gun and breech: 12 quintals = 12 X 112 pounds = 1,344 pounds, to differentiate it from other 12 pound guns.
I have done some research and found my match.
This book from the John Lambert collection ( the same as for the armed trawlers) contains all the necessary information and drawings.
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[url=https://postimages.org/][img]https://i.postimg.cc/MGXZYw85/Screenshot-2022-02-15-18-18-53-120.jpg[/img][/url]
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I also made a harvest of other photos always useful for the 3D drawing:
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[url=https://postimg.cc/06fXL3ws][img]https://i.postimg.cc/d1PMTcQL/1336719-38473-63-pristine.webp[/img][/url]
[url=https://postimg.cc/MfXL0DX8][img]https://i.postimg.cc/T1cX6N6h/1920px-Visitor-at-opening-of-Bessborough-Armoury-looks-through-QF-12-pounder-gunsight-Vancouver-1934.jpg[/img][/url]
[url=https://postimg.cc/bsDMs3Kx][img]https://i.postimg.cc/KvJypWfH/2560px-Arthur-Lismer-HMCS-Grilse-on-Convoy-Duty.jpg[/img][/url]
[url=https://postimg.cc/WFNCzjvz][img]https://i.postimg.cc/MTVSsK37/2560px-Civilian-inspects-gun-aboard-HMCS-Rainbow-Vancouver-1914.jpg[/img][/url]
[url=https://postimg.cc/xqFhfWFj][img]https://i.postimg.cc/5NxV3JBz/2560px-Dunree-Fort-Coastal-Defense-12-Pounder-Gun-2014-09-12.jpg[/img][/url]
[url=https://postimg.cc/K1tH54c4][img]https://i.postimg.cc/VkhPmb39/2560px-Japanese-Battleship-Mikasa-at-Yokosuka-2013-secondary-battery.jpg[/img][/url]
[url=https://postimg.cc/ygL5S51P][img]https://i.postimg.cc/Vvwc2Q23/2560px-Visitors-inspect-QF-12-pounder-12-cwt-gun-at-Bessborough-Armoury-opening-1934.jpg[/img][/url]
[url=https://postimg.cc/kD5Ldnsh][img]https://i.postimg.cc/sfPz7xhy/Dunree-Fort-Coastal-Defense-Gun-II-2014-09-12.jpg[/img][/url]
[url=https://postimg.cc/ZCGQ36S1][img]https://i.postimg.cc/bwrf7RFN/Fort-Siloso-Sentosa-Island-Singapore-4374802169.jpg[/img][/url]
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