Swiss, 15-jewels (?), lever escapement, stem wind, pin set, bridge model, circa 1880 (?). Could be a karat gold case, but we would need to see the markings inside the case back. These can be hard/impossible to identify a maker because of the production methods. The R and A marking refers to regulating the time keeping. R means Retard (slower), and A means Advance (faster), and mean nothing in terms of an identity.
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