Luminous moon pahse indication,anti-reflective sapphire crystal, sapphire crystal back, screwed-in crown.

The Ball Watch Company is focused on building the mightiest, robust watches that endure all adverse conditions. Ball is single-minded in their commitment to this vision.
Along the process, we faithfully create a family enterprise that genuinely fosters on humanity and have fun in our endeavors.

Ball Watch Company Since 1891, accuracy under adverse conditions.