Issue eye glasses designed for use with the gas mask.
This issued pair of eye glasses in case, designed to be worn with the gas mask. Any other glasses might allow gas to leak into the mask. A label has been affixed to the inside of the case. The case itself is made probably of tin and covered in black leather, lined in black wool. The glasses are uncleaned, and appear to be german silver rimmed. I don’t see any maker markings.