First Post - Need Help with Navy Marked Luger

[EJINPA]

Howdy, it seems that I have entered the world of Luger identification! I have had this pistol for some time, and now that we are housebound, decided to take some time and figure it out. As you can see, it has no date, no proof marks and no # suffix. I understand the Ostsee mark ok. Any help would be greatly appreciated. If more photos are needed, please ask. Thanks! E.