BALL "NEDU" black dial Engineer Hydrocarbon Chronograph watch with automatic ETA7750 COSC certified movement, titanium case with rotating bezel, beveled sapphire crystal, patented crown protection system and helium valve incorporated, and micro gas tubes for night reading capability on dial and in pushers.
Factory Model Number. DC3026A-SC-BK.
Bit of History:
Worlds first diving watch with a helium release valve incorporated into the crown. NEDU which stands for "Navy Experimental Diving Unit" is the unit of the US Navy responsible for rolling out operational diving and decompression rules for the military. As a pioneer in creating watch standards in the end of 19th century for American watch companies, its a very good match between the two brands - Ball and Navy.
Certified COSC ( Controle Officiel Suisse des Chronometres ) Chronometer. Cold temperature endurance to -40 C.
Day/Date calendar, window display. 12 hr, 30 min, 60 sec registers chronograph.
Satin finish. Pure Titanium.
Uni-Directional rotating, ratcheted, 0-60 Elapsed-Time. Ceramic hi-tech material, extremely scratch-resistant.
Sapphire. Anti-Glare treated. Flat profile. Faceted.
Combination satin/polished finish. Each link segment consists of a combination of titanium and stainless steel.
42.00mm. 18.00mm. 44mm over the bezel.
Comes in a very exquisite and unique presentation box. Original factory papers.
Shock resistance: 7,500Gs