I would be very surprised if it was not 9mm, although it could have been re-barreled I suppose. It started life as a 9mm. As to what a dealer says, it depends if he/she is familiar with Lugers, some people think "Its a Luger, so its worth a lot of money". Personally I wouldn't go over $500, but that's partly because I don't like double-dated Lugers, other would certainly differ.
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