Two strand bead set of glass beads from the 1950s are graduated in size and separated by ribbed silver tone connecting chain.  There is a slight aurora borealis coating on these mostly-clear beads that measure from 11 1/2 mm to 6mm in diameter.  Choker length, the shorter strand measures 14" with an additional 3" length of beads at the hook closure which is stamped "W. Germany".

 

View of the clasp: