complete rig

Can anyone tell me more about a Luger I recently obtained? I finally got the Navy rear sight to open to the 200 but it doesn't have the standard push button. I had to unscrew a cap on the right side of it to slide it back. All matching serials and the bluing and straw look to be in the 95%-98%...

I recently acquired a Luger from a family member and I have been trying to determine its origin, markings etc... I have had several opinions on other boards (including "a toy gun") but have yet to come across a definitive. I purchased the Standard Catalog of Luger and still no closer to finding...