Unique and very cool Vintage aviator glasses.  From an estate sale, so I don't know the history.  They are in a metal case with a felt lining.  The glasses have a really cool embossed bridge with the words 'SUN PRUF' and sun rays.  The bridge is flexible.  The frames have a tortoise shell design--some type of early plastic / Bakelite, I think?  I am unsure of the material of the arms.  Please ask any questions you may have.