Measurements:
Full Piece Medal Size:  1 1/4" Diameter (Includes Both Half pieces)
Half Piece Medal Size:  1 1/8" x 3/4" (Length x Width)
Chain Size:  One 24" Length and one 18" Length.

Sterling Silver two-piece Mizpah Medal with Genesis "18.24"
stamped on the back of each side of the two-piece medal.
One half of the medal has a 24" chain and the other half of
the medal has a 18" chain.  Chain is Rhodium Steel Finish
Silver Plated.

Back of Medal