First Post - Need Help with Navy Marked Luger

[EJINPA]

Ok, here are more photos of the pistol. Not sure about any numbers not being "original", but I can tell you that this was personally purchased right off the attic, so if they are not of a recent (last 80 years) addition, that I can assure you. Again, thanks for your input and expertise in helping me know exactly what to call this piece. Best, E.