The pictures below show a model used by the BGS "BundesGrenzSchutz"
This is the helmet with vent holes







LS stands for the manufacturer Linnemann & Schnetzer,
https://www.linnemannschnetzer.de/company.html,
It seems that they do not make any helmets anymore.

Read about the BundesGrenzSchutz or BGS
https://en.wikipedia.org/wiki/Bundesgrenzschutz
or read about GBS history: https://www.nadir.org/nadir/archiv/Antirassismus/bgs_broschuere/t21a.html
See a video bundesgrenzschutz video
Partage