[mrerick]

That is a relatively early New Model Parabellum.

According to Sturgis' research, a small number in your serial number block were made from long frame Navy Pistole 1904 components. He indicates that there is a flat milled at the base of the frame and a noticeably flatter rear grip area where the stock lug had been milled away by the factory.

These were originally in .30 Luger. The barrel profile is unusual and is not likely to have been a factory barrel. In some ways the base looks like a later Swiss W&F Luger barrel base.

Good sharp pictures of the base of the frame (the magazine well opening area) and the rear lower shape of the frame would be helpful. Take them in natural shaded light outdoors, and use a tripod and the camera's closeup setting to get sharp focus.

Marc