[lugerholsterrepair]

With few exceptions they are running in the high 1800's to mid 2500's for an imperial luger with low serial number so this sample appears fairly priced in comparison.

Look I hate to seem argumentative but you are not hearing...THE REAR SIGHT IS SMASHED! This is more serious than GERMANY or worn grips or whatever else concerns you. It affects the PRICE a great deal IMO. It's not like it was the front sight in that it cannot be replaced. You seem to be ignoring this.
Low serial numbers mean..well..NOTHING. What means anything is matching and condition. You are missing 50% OF THAT EQUATION.
It would be a collector piece..well sort of a collector piece... with a SMASHED OFF REAR SIGHT! In collector circles a SMASHED OFF REAR SIGHT is a serious negotiation for a price adjustment even if you want a pistol with a SMASHED OFF REAR SIGHT. Take a look..it's right over there..and one last piece of advice..when you go to sell this pistol the buyer is going to hit you over the head with LOOK! A SMASHED OFF REAR SIGHT!

Hey good Luck! It's your hard earned after tax cash.