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Information about this bayonet
This bayonet has not yet been identified.
Information from other sources
George Moller, American Military Shoulder Arms, Volume III, shows that 999 Moore Short Enfield Rifles were produced by John P. Moore’s Sons of New York City between January and March in 1862. This rifle has a raised saber bayonet stud 1.375 inch (34.9 mm) long brazed to the right side if the barrel 3.375 inches (85.7 mm) behind the muzzle. The foot is notched in the middle of the upper edge for the bayonet’s catch.
One of the few pictures showing the bayonet lug is found on the Rock Island Auction Company's web site. https://www.rockislandauction.com/detail/84/234/civil-war-j-p-moores-sons-short-enfield-pattern-rifle
Speculation and questions
Based on Moller's description of the bayonet lug and what few photographs that can be found. It appears that the notch for the bayonet's stop pin is pretty close to the middle of the 34.9 millimeter lug creating a requirement of a Lug to Stop Length of about 16 to 18 millimeters. An unusually large dimension that only a few known bayonets meet this size requirement, such as Unknown Collins #8, Unknown Collins #11 and the PS Justice series. More dimensions on the bayonet lug and the outside muzzle diameter are needed to carry this idea any further.