MOVEMENT
CUSTOM 3 HAND SWISS WITH EASY TO READ TIDE SUBDIAL. QUICK ADJUST BUTTON FOR EASY SETTING OF SUBDIAL.
CASE
CUSTOM 300 METER STAINLESS STEEL WITH HARDENED MINERAL CRYSTAL, EXTERNAL ROTATING BEZEL WITH COUNTDOWN TIMER, AND 9:00 CROWN POSITION.
BAND
CUSTOM SOLID STAINLESS STEEL WITH BRUSHED FINISH AND DOUBLE LOCKING CLASP.

More info here : Nixon 51-30