Looks to me like a pre-WW1 Improved model D, barrel and cylinder married up to a 1920's Stock and trigger block. I have seen it done many times as all the parts are more or less interchangeable. Still I bet you it shoots straighter than most people can hold it
Lakey
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Done my bit for the BBS: http://www.airgunbbs.com/showthread....-being-a-mod-… now I’m a game-keeper turned poacher.