Here is a very neat piece, anyone who ever served in an armour regiment can appreciate the humor.
www.collectorssource.com/canadian-zipperhead-helmet-with-radio-gear.html
From the look of the helmet I would say late 1960's to early 1970's, which would be about the right time for the Star Trek logo being popular.
Armoured crewman are nicknamed zipper-heads due to the numerous cuts and scrapes your head receives from bouncing around inside a metal box.
Mike
www.collectorssource.com/canadian-zipperhead-helmet-with-radio-gear.html
From the look of the helmet I would say late 1960's to early 1970's, which would be about the right time for the Star Trek logo being popular.
Armoured crewman are nicknamed zipper-heads due to the numerous cuts and scrapes your head receives from bouncing around inside a metal box.
Mike