Hi, Today I found a Luger in between a wooden floor. Can anybody tell me more about this gun and I.D where this gun came from. (Don’t mind my dirty hands, it’s from all the dust where I found it)

Hello, This is my first post and hopefully someone will be able to help me out. This is a family heirloom brought back from WWII by my wife's grandfather. I have researched the serial number as much as I can, but haven't been able to track it down to any production date, or how rare it is. The...