Thank you for the pics. I believe it was usual to only number one of the grips, but am not certain.
based on the pics and everything being the same general condition, I'd say a "force match" is doubtful. I can see traces of the straw color on the small parts, and the magazines are period correct for the pistol, though if you can't find matching numbers on them, I wouldn't assume they were the original mags.
My book lists that model as "common" (by # produced). Looks to be in good condition, (bore needs cleaning
) Finish appears original. I don't know if its actually worth $1700 today, but if not, it will be eventually.
Looks like a good example in decent shape, and about as original as you are likely to find for a WW I Luger. With the holster tis not a steal at the asking price, but its not the most outrageously priced Luger I've seen, either.
Again, you need to find someone currently in the Luger buy/sell market to get an idea of the current value. Personally, if they let you put it on layaway, I'd buy it.
If you do buy it, and plan to shoot it, DO NOT use any kind of NATO spec or +p ammo!!!! That gun was built to run on German service ammo of the day, which was a 115gr at 1150fps. Anything hotter is a stupid abuse of a fine antique.