Original Rare U.S. 1950s Era Experimental X51 "Universal Helmet" Liner with Intact Rigging - Size Small Snider Rifle Several famous lieutenant-ranked (Kapitänleutnant) U-boat

Several famous lieutenant-ranked (Kapitänleutnant) U-boat commanders

Originally issued to the Union troops

With only the one "surviving" example in a Carbine form previously known finding a full size example was a great surprise

• WWII Expert Rifleman with EGA (RARE)

Original Rare U.S. 1950s Era Experimental X51 "Universal Helmet" Liner with Intact Rigging - Size Small Snider Rifle Several famous lieutenant-ranked (Kapitänleutnant) U-boatOriginal 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.