Original Rare U.S. 1950s Era Experimental X51 "Universal Helmet" Liner with Intact Rigging - Size Small Category_Martini-Henry Bayonets Helmet has blue triangles or

Helmet has blue triangles or "division tags" over each ear

The M1917 is a near identical version of the British MkI steel helmet

the ST 63 was the MG 17 Machine gun

1939 (Heft 19)

The stock does not have any repairs or major damage we can see

Original Rare U.S. 1950s Era Experimental X51 "Universal Helmet" Liner with Intact Rigging - Size Small Category_Martini-Henry Bayonets Helmet has blue triangles orOriginal Item: Only One Available. Well these are RARE!!! There isn't much information out there at all about the X51 helmets, which were developed and tested during the 1950s. They were seen as an attempt to use new technology to improve upon the M1 helmet, which had served the U. S. Military well during WWII. Also with the post war budget cuts, they looked to create a "Universal Helmet", which would be able to meet the needs of all service members.