Hard to tell from your pics but it looks like a standard military type action ?that someone made into a takedown 22.Probably made in the 1880s and original caliber was 577/450.You can date your rifle by looking at the proof marks on the action and comparing them to the British proof mark charts available online.
Here are some of my 22 martinis.These are all variations of Francotte martinis and were centerfire rook rifles converted to 22lr at the turn of the century.The top two have safety levers and the top one is a takedown while the bottom two are action take downs only
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