At the same time this beret was used there was also a protection cap in use:
http://combathelmets.blogspot.com/2008/06/schutzmutze-west-german-tankers.html
List of German Berets
Back to Das schwarze Barett
This video shows a beret like this used in a Leopard:
https://www.youtube.com/watch?v=VXgrZVdWej8
Partage