This is the "Great Wave" version of the SD1975 which pays tribute to the "Grandfather Tuna" or"Tuna Can" first manufactured in 1975 after a Japanese saturation diver complained that all the existing diver watches were not strong enough to withstand heavy impact and prolonged periods of deep underwater pressure. The "Tuna" was therefore designed to be the "perfect professional divers' watch" and one of its innovative features is the shroud that makes the watch extremely robust and also very distinctive.
Movement: Japan NH35 automatic, 41 hours of energy storage.
Case material: 316L stainless steel, PVD plating
Case back: 316L stainless steel
Bezel: 120 click unidirect rotational ceramic bezel
Watch mirror: sapphire crystal with AR coating.
Water resistance: 300m / 30 ATM
Luminous: Full dial lume,Swiss C3 green and BGW9 blue super luminous.
Crown: Screwdown Crown
Case back: Screwback Case
Case diameter: 47.5mm ( without crown)
Case length: 44mm (lug to lug)
Case thickness: 15mm
Lug width: 22mm
Warranty: 2 years
Returns policy: 30-day return and refund.
Style: automatic watch, dive watch, luxury watch
Package: watch, box, warranty card, user manual