Scratch-resistant sapphire crystal, with several layers of anti-reflective coating on both sides
Screw-down case back
Ø 43.00 mm
Water-resistant to 30 bar
Screw-in crown, Unidirectional rotating bezel
The Ultra Most Accurate Watch
Inspired by the original Longines Ultra-Chron Diver of 1968, the new model and its new high-frequency calibre represent the first reinterpretation of what sets Longines apart – its status as a pioneer in the world of sports timing.