WWII set of cased RAF bomber aircrew issue sunglasses

WWII set of cased RAF aircrew issue sunglasses. Excellent complete set of RAF bomber aircrew issue sunglasses. Round green/grey  tinted lenses with spung ear loops, size medium. 
These glasses come in their original Air force gray steel Mark VIII case with a blue velvet inside as found. Lit is marked in five rows : /I\  - STORES REF. 22C/1072- over SPECTACLES. MARK VIII A AIRCREW-
over ANTI FLARE MEDIUM- over 8788. 

These were issued to RAF bomber pilots and aircrew members during WWI and during the Cold War.

Rare genuine item, fully wearable.