Advice on Luger purchase requested

[alex]

I just joined this forum as I have been offered a Luger and I wanted to find out if it is worth purchasing. I will be going to look at it this weekend and want to know what to look for, as I am not a luger collector. The info I have so far is:

Make: DWM
Barrel: 4"
Calibre: 9mm
Condition: Not sure, will know when I see it, however the seller states that it is "original finish/condition", not reblued.
Bore: Unknown
Serial #: I did know enough to ask if it was matching and he confirmed all numbers match except...magazine is missing.

Asking price is $175.00. First, is this a reasonable amount given the info I have provided?
Second: What in general should I be looking for in terms of markings for a DWM?
Lastly, what type of mag would be correct, what is their availability/price?

Any info would be appreciated, prior to taking a look at it. I will also take a digital photo of it.

Regards, Alex