Original 1961 U.S. Navy MK IV MOD 1 High Altitude Full Pressure Flight Helmet with Original Carrying Case- NASA Mercury Program Original Machine Gun Part Sets The top of the phone

The top of the phone is marked: TELEPHONE SET "F" MK

This definitely would have been helpful in rougher seas

This is an model 1926 helmet that definitely looks to have seen a long service history

The pioneer part of the platoon name meant that we were trained to do small engineer work that could be handled without heavier equipment

The kit itself appears to be complete though there may be a few items missing

Original 1961 U.S. Navy MK IV MOD 1 High Altitude Full Pressure Flight Helmet with Original Carrying Case- NASA Mercury Program Original Machine Gun Part Sets The top of the phoneOriginal 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. This is an excellent example of a very rare U. S. Navy Mk IV, Mod 1, Type 1 Helmet. Undoubtedly one of the absolute hardest examples of U. S. Military Flight Headgear to locate, with very few having been made, and even less surviving to today. These helmets seldom come to market, with most