The GM 43 MK-II was a'tricky' device used. By the Germans Forces against the Allies after the.
6th June 1944 D-Day invasion of the Normandy coast-line. In order to make such devices less detectable.The entire body was made from glass. Which also saved precious metal stocks for other uses. Measuring 4.5" across and 0.5" deep. And in a superb mint, undamaged condition.
This one of a small batch of 7 glass pressure plates. Soissons near Compiegne in France. A cracking piece of German defensive kit.
From the post-D Day 1944 battlefields of Normandy.