1906? Mystery Luger

HELP!!! I am the owner of a Luger that ostensably is a 1906 long frame with hold open device.Here is the problem. The gun is commercially markings (germany, crown n on bbl and frame.Extactor marked galladen,saftey not marked except by polished area on lower portion of saftey lever travel. Cal. 7.65 Luger. Six inch pencil bbl. THE GUN IS ONLY SERIAL # ON FRAME BELOW REAR OF TOGGEL. The gun has never been refinished so serial #s not polished of in other areas.

No one has been able to identify this gun, and it is the only one I have ever seen with just one serial # and that in the position it appears. The bbl. length is also non standard and the gun does not have navy sights. I do not believe it is a 1920 commercial.

Pics and serial # supplied to any kind soul who feels he or she can help me.

Thanks for any help you guys can give me.

Bruce