Original U.S. 1950s Navy Fighter Squadron 92 High Altitude Full Pressure MK IV MOD. 1 Flight Helmet & Mark IV MOD. 2 Pressure Suit with Detachable Gloves, Life Preserver and Helmet Transit Case - NASA Mercury Program Sales The 39" barrel bears British

The 39" barrel bears British proof marks and the brass furniture displays no turning

" Volume 1

The support for the front insignia has also detached from the cap band

This is a WWII M1 helmet high pressure helmet liner

' meaning that the rear of the cylinder was turned to a smaller diameter than the front

Original U.S. 1950s Navy Fighter Squadron 92 High Altitude Full Pressure MK IV MOD. 1 Flight Helmet & Mark IV MOD. 2 Pressure Suit with Detachable Gloves, Life Preserver and Helmet Transit Case - NASA Mercury Program Sales The 39" barrel bears BritishOriginal Item: Only One Available. A nearly identical example of this MKIV High Altitude helmet can be found in the Smithsonian Air & Space Museum at this link: USN Mark IV Helmet. A nearly identical example of this Mark IV Pressure Suit can be found in the Smithsonian Air & Space Museum at this link: USN Mark IV Pressure Suit. This is an excellent set, only the second complete set we have ever offered, consisting of a very rare U. S. Navy Mk IV, Mod