Peet,
Your photo looks like this one for sale with Doug Smith of FGS, Inc. They want nearly $ 1600 for this boxed one.
It is a 1970's P-06 with a 6" barrel. They came both in 9 mm and 7,65 mm.
Your photo is not a Navy luger in the traditional sense (Imperial/WWI or Weimar era) and is not one of the 1980's Mauser commemoritive Navy lugers, either. Those have a facsimile of the Navy rear sight that is adjustable.
