New member saying hello

[Pappy1600]

Just want to say hello to the forum, I am retired LEO and also a FFL dealer, I may have a very nice collection of commercial and military Lugers that probably will be coming in on consignment, I saw 5 of them, believe 4 were early commercial, snapped a few pictures as well, some even had the original holsters and one had a matching serial number magazine, all the pistols appeared to be matching numbers.

I by no means have experience with Lugers and would like to seek out knowledge from the forum in order to get the owner the maximum dollar amount from the collection, (They are friends)I did print out the data sheet so I have a starting point.

Any information would be greatly appreciated when this happens. This loose magazine was in a box with a bunch of parts, I believe to be early commercial it is unmarked with no serial number. Any idea what it is?
Regards,
Terry