Upon further research, I stand corrected. There was a 330-M8 scope designation which would significantly increase its value. From what I've discovered, there were two 330 scope designations for the WWII 1903A4 sniper rifle.
The first is the commercially available 330S-M8 marked scope with post reticle for early A4 rifles. The "S" designates it as the silent screw adjustment with knurled locking collar.
The second is the military 330C-M73B1 marked scope with crosswire reticle for later A4 rifles. The "C" designates finger click adjustment knobs.
Your scope appears to be marked "330 SCOPE M-8" and should adjust by loosening the knurled collar, rotate & adjust the screws by screw driver or coin, and then while maintaining the screw position, finger tighten the knurled collar.
Hope this additional information helps.
Last edited by 3dtestify; 09/19/16.
