Tom is correct in that it is a 1910/34 mauser and it is in .25 cal. It is also an extremely late serial number being in the high 425,900 block and very near the transition from Crown N to Eagle N proofs. Eagle N's are very, very rare and a better photo of yours in the area of the front right side would verify one way or the other. As to the originality of the finish, I tend to believe it original, but as previously stated better pictures would be of benefit.
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