Calibers for the C96's are:
7.63 Mauser (most common chambering)
9 m/m Luger (unusual, but not rare)
9m/m Mauser Export (rare)
8.15 m/m (very rare, believed to be DWM cartridge no. 580)
9m/m Largo (some Spanish copies of the C96)
The Shansi Arsenal in China produced a Broomhandle in .45ACP, but this was not actually considered German production.
I have never heard of one in 7.65 Luger. Is the barrel marked as such? I also have not seen a Broomhandle with an adjustable front sight. Perhaps the upper on the pistol in question was a custom aftermarket addition? The short barreled (3.9") guns produced during the 20's and 30's are often referred to as Bolos, the word coming from the term "Bolshevik", as many of these guns were exported to Russia, and were the favorite sidearm of said Bolshevists. Many also found their way to China, and quite a few returning from there have had inferior grade Chinese parts added to them.
As to the second gun in question, If these are indeed 1930's German export numbers, I see very little reason for them to detract from the value of the gun; it would be merely an addition to it's historical path. Yet, I have never seen a 30's German export marked with anything other than the word "Germany", or "Made in Germany" as an export mark. Do the *original* serial numbers on the pistol and stock iron match? A scan of the gun and marks would be very handy to determine what the beastie actually is. There are many variations, from Commercial to Military, that would affect value on this rig. I would of course assume that all small parts, barrel, frame, etc. also are matching numbers on this gun?
Please refer to Kyrie Ellis' excellent history on C96's and tips for ensuring the safety of potential shooters on the following page:
www.recguns.com/IIIC2m1.htmlThis page will also be of help to try to pin down a better ID of the guns via serial # range, and physical description.
Once a solid ID is confirmed, a value will be easier to determine.