The Other Kerr - The Center Fire RevolverCased London Armoury .450CF Revolverhttps://www.thebroadarrow.info/london-armoury-450CF-revolver
This unusual British cartridge revolver is marked on the top strap London Armory, Jas Kerr & Co. 54 King William St, E.C. The right frame is marked B.L.693 and ADAMS PAT, 39,693.
This 6 shot revolver is chambered for the standard British .450CF cartridge and has a 4˝” barrel. The upper right frame is stamped with the South African registration number L3610. Underside of barrel, loading gate and cylinder marked with serial number 1918. There are London proof marks on barrel and cylinder but no proofmarks visible on the frame.
The revolver is cased in it's original oak case with correct London Armory trade label and accoutrements include cleaning rod and glass oil bottle. The label on the oil bottle reads ‘Young’s Celebrated Extra Refined Oil; For gun and rifle locks; Will not corrode’.
Kerr Percussian Models 
Kerr's Patent Revolver Barrel numbered "2254"
BBL: 5 3/4 inch octagon - Caliber: 45 CF - Finish: blue - Grips: walnut - Serial Number655
Possibly one of the Spanish Kerr's that has been converted from percussion to centerfire. https://www.forgottenweapons.com/kerr-revolvers-an-english-source-for-confederate-arms/
James Kerr formed the London Armoury Company in 1856, manufacturing Adams patent revolvers (Adams was one of the founding investors) and 1853 pattern Enfield rifles. The rifles were the better business and the company rather quickly decided to focus on them, which led Adams to leave with his patents. In order to keep a revolver in the LAC’s catalog, Kerr patented his own design, which proved to be a quite effective handgun.
When the US Civil War broke out, both the Union and the CSA sent procurement agents to Europe to purchase foreign arms, and the Confederate’s Captain Caleb Huse struck a substantial deal with the London Armoury Company. The Confederacy would ultimately purchase more than 70,000 Enfield pattern rifles from LAC, as well as Kerr’s patent sharpshooting rifles and 7,000-9,000 Kerr revolvers – the vast majority of LAC’s production during the war. So much of their production, that the LAC would actually fail and dissolver in 1866 when their best customer ceased to exist.
The revolver design was made in single and double action versions and in both .36 and .44 calibers, although the CSA purchased guns were all single action .44s. The action is basically a simple rifle style lockplate mounted on the grip and frame, isolated form the soot and fouling of the black powder very well. The cylinder is easily removed via an axis pin entering the rear of the frame, and the guns could be easily serviced by any competent gunsmith without need for any special knowledge or parts.
