The first version of Swiss AF H-5s, provided to jet (Vampire/ Venom) pilots after ejection seats installation. Previously SAF pilot flew those aircraft wearing British C-Type or Swiss "Stoffhauben" with H-type oxygen masks.

Compared to "standard" H-5 ( to my knowlege, any help appreciated), here the Swiss modifications implemented:

"Standard" British MK-2 visor fitted;

LH oxygen mask leather pad reshaped;    

Six poles comm plug suitable with aircraft original British comm systems installation.

Rear comm cable exit supplemental leather hose fitted in order to bend the cable to the left; 

At the same time, replacing the H-Type mask, the A-14 oxygen mask was introduced, modified  with a supplemental diluter valve;

Due to "jet only" utilisation, no boom mike "banana mount" installed.

More on H-5 HERE

A-14 mask with supplemental valve.

Modified LH leather tab.

The six poles plug compatible with British comm system.