Missing in action.

With research and the help of many, I'm pretty sure the missing luger was a Portugeses Navy. Unfortunately the finish IS hard chrome per my partner in OR who Shot and handled it on numerous occaisions. But I still need to arrive at a model number. The documentaion I have gives Three different dates 1915,1921, 1925. If the weapon is indeed a Navy would ANY of these dates be accurate? And finaly I need a best guess on the value asuming the best except for the finish, which beaks my heart. The insurance co. needs something ASAP. Many thanks,

Jim