Seiko Presage SSA397 Green Dial Power Reserve Masterpiece as well as special components

as well as special components employed between the band and case to ensure a very comfortable fit

The buttons are protected against the entry of mud

domed on both sides

water-Resistant: up to 10 atm/100m/328ft

Both the Heuer and the other references like the LeJour 7750 used the Day-Date Chronograph Valjoux 7750 and as you can tell this is how the LeJour got its reference name

Seiko Presage SSA397 Green Dial Power Reserve Masterpiece as well as special componentsFrom the Presage Collection Fine mechanical watchmaking from Japan Manual and automatic winding capabilities 21,600 vibrations per hour Power reserve: approximately 41 hours