My first Luger !!

[soko121]

Hello All,
just purchased my first luger. here are pics. Please can you tell me what you know about the pistol, there is one part mismatched, it is the forward center piece of the toggle,( cartridge holder??) that is a different serial number, all others match. the mag that came with the gun is a shiny silver metal mag with plastic cartridge plate and a wooden bottom, no markings, is this an after market mag?, the spare magazine is pictured, what does this go to? looks WWII to me so wrong date?, also what is the holster, i have not seen this type before. This gun was a bring back, i just purchased it from the grandson, it had been passed down to him. I also just purchsed a 1918 Eufurt, hope to have that in a few days, its all matching. i was not planning on getting 2, but this one came up 10 minutes from my house so i was over there as quick as i could
I would appreciate any information you can give on what i have.
Simon