1929 DWM 9mm Police

[DaveDimmick]

This is my first experience on Luger forum so bear with me. In fact I have never held a Luger until a few days ago. This luger was liberated by a WWII soldier and stored away until just recently. I'm trying to help the old boy gather more information on it. I call it a 1929 because 1929 is stamped on the holster.
The serial# is 1864 with a t underneath it. The pistol as well as clips all have 1864 or 64 part numbers that I can see. I have not disassembled it. What is strange to me is the chamber/action can be opened about half way by pushing back on the barrel. Never been around a luger before but I don't think this is right.
The pistol, holster and a long police bayonet are all stamped with L. Mg. 206 I am assuming this is a code for a city in Germany.
I have not been able to find disassembly instructions yet.
My questions:
- Is it a police model?
- Am I wrong on the date?
- Is action supposed to open by pushing back on barrel?
- What does L. Mg. 206 mean?
- where can I find disassembly instructions?
I realize I'm pretty green when it comes to lugers but any guidance or suggestions would be appreciated. Thanks, Dave