New to Lugers - Question about numbered parts

[WWIINut]

I just made a trade with one of my gun buddies and acquired a 1916 DWM Luger. Its in decent condition and from what I can tell has all original finish. All the parts that should be straw finish look that way. The barrel has moderate pitting for the first inch or so and then slight pitting to muzzle.

As far as numbered parts, he grips have definitely been replaced at some point and have no number. The magazine is correct for the date but doesnt match. All the other numbered parts match the primary serial number except for the takedown lever (locking bolt). The odd thing is that the number of the lever is "85" and everything else is "86". Now, I wouldnt question it being replaced if the number were "19" or "34" - something completely different. But, is there any chance that they miss stamped or switched them at the factory? (I know, who knows what they did over a hundred years ago!) It just seems like very low odds that it could be replaced years later, just this part, with one number off.

Another question - given the described condition, what would be the approximate range of value? I just want to be sure my trade wasn't too out of line.

THANKS!