03-09-2011, 05:49 PM
Front seam, swivel bale helmets appeared around September 1944 in the ETO (maybe even sooner).
I guess the same goes for the MTO.
New units and new reinforcements to the units already in the MTO must have worn those types already.
Rear seam, swivel bale helmets were never worn in WWII as far as I know.
Hope this helps.
Erwin