Rare Vintage WWII Army Issue Aviator Clip On Sunglasses in Case

Vintage WWII Army Issue Aviator Clip On Sunglasses in Case. 4" long. Black with brass-tone frames. The original case still contains the paper instruction/warnings(!) issued by the Army Conservation Program. Item number on that paperwork is 31-M-4. Glasses are in very good condition, case also. A great vintage army piece. Very rare, especially with the case and sticker.