Although the bluing and straw colors are exceptional, at the end of the day this gun is a .30 commercial with a suffix issue. This is certainly not the find of the century and most likely is a totally non-military gun, regardless of the holster.
Also, I would doubt that any numbers (date) were ever over the chamber, but close-ups would help.
Although we still haven't been told what the asking price is, unless you want a .30 commercial Luger keep your money in your pocket.
dju

Asking $2400.

Thanks. I'll take your advice and keep my money. By the way, they claim it's a 9mm. How can you tell?

It does look pretty but I would say $1800 is the top end of that type of pistol. For reference, I paid about $1200 for my .30 commercial all matching 5 digit SN (a less common variant of interwar commercial Lugers) with about 75% blue and 30% straw on it.

7th photo down shows the muzzle, and the metal around the bore looks thicker than a 9mm. The barrel OD is the same, but the bore size differs. But then it is hard to be sure from one photo.
But regardless, I'm not seeing a $2400 gun.
dju

$2400 is way too much for the OP pistol.
The overstamped "K" relegates it to shooter status, and a corresponding price maybe 1/3 of the asking price, JMHO. :)

As a .30 Luger shooter, it's probably worth about $800 just as Don says...

You'll find a lot of useful information in our forum's FAQ PDF document. Just follow the "FAQ" links at the top of each page.

From my perspective it doesn't look reblued, and the pictures I think are absolutely great.

I am a bit confused. Did the post war Lugers have an old style Trigger bar ?
Armin.

Not when made; but in nearly 100 years most any part could have been changed.