Original WWII Type U.S. M1 Rear Seam Swivel Bale Helmet with Fiber Liner- WW2, Korea, Vietnam Original WWII Type U.S. M1 Rear Seam Swivel Bale Helmet with Fiber Liner Genuine U.S. military issue as used in WW2, Korea and Vietnam. Post WW2 manufacture but nearly identical to the WW2 M1 Helmet. Shell chinstrap is not included, liner chinstrap is included. Offered in good used military surplus condition and will have minor imperfections.