Great wind-up watch with  a deep electric blue face set in clear plexiglass, this watch hangs from a 24" silver tone chain.  The back of the watch is clear allowing you to see the movements of the watch.  The back of the case is marked "All Plexiglass Case Basic Watch Swiss".  Looking through the clear case, the metal parts are marked "Swiss unadjusted One 1 Jewel".  The blue watch itself measures 1" in diameter and the clear plexiglass case measures 1 1/2" in diameter.  The case also has an attractive diamond cut edge that creates a bit of a sparkling effect.  The watch runs well.

View of the clear lucite back:

Full view when worn: