Vtg WWII Era Aviator Motorcycle Rockglas Glasses w Elastic Strap Case Rare

This is a pair of unique WWII era aviator/motorcycle glasses. They are in a Rockglas by Beck hard metal case and are in good used vintage condition. I do not know if the straps were original to the glasses because I cannot find this exact pair online through research. The lens are in good condition and great to wear or add to a collection. Please look at all pictures for type, condition, and measurements. Thank you for looking and I am open to reasonable offers. (Cross listed.)