German 10.5cm Cannon Boresight Tool

This is a genuine WWII 10.5cm cannon boresight tool with WWII German markings a scarce find, used to boresight barrel to gun sight to save ammunition crosshair pice is placed in the muzzle and the disc positioned in the breech with the two large finger holes, the central eye piece is used to sight up with the crosshair.
A very interesting and unusual piece of German militaria.
Any questions please ask.

Code: 50293