top of page
In 1968 a Japanese saturation diver complained to Seiko that all the existing diver watches were not strong enough to withstand heavy impact and prolonged periods of deep underwater pressure. After seven years of development Seiko launched the “perfect professional divers' watch” in 1975. One of its innovative features is the ceramic protective shroud that makes the watch extremely robust and also very distinctive. Aficionados of Seiko watches thought it looked like the wearer had a can of tuna strapped to his wrist, hence the nick-name, “Tuna”.


It’s a big watch - though the relatively short lug to lug width means it’s not impractically so - and people either love ‘em or hate ‘em. It’s ironic a watch that looks like a can of tuna should be such a “Marmite” timepiece.


Also available in Blue or Green, this is the Black SD1975 and benefits from the following spec:


Sapphire Crystal Glass

NH35 Automatic Movement
120 Click Rotational Ceramic Bezel
300m Water Resistance
Screwdown Crown
Screwback Case
316L Stainless Steel Case
Stainless Steel Jubilee Strap fitted and free Rubber Strap also supplied
Hacking Movement
C3 Luminova on the face

Lug width - 22mm

Case Diameter - 47.5mm
Lug to Lug - 47.5mm
Case Thickness - 15mm
Weight - 210g
Hard Presentation Box and warranty card


Overall the SD1975 is a superb watch for the money. It is reliable, hard-wearing and looks fantastic. It is a real chunk of a watch that constantly gets positive comments from owners and admirers and definitely makes the wearer stand out from the crowd. We also supply a free Steeldive branded rubber strap with fitting tool and extra pins so you can give the watch a different look if you want.

STEELDIVE SD1975 "Tuna" Automatic 300m Diver Watch

  • 30 Day Return to Base Warranty with Steeldive Uk

    6 month warranty with Steeldive Factory

  • Free Royal Mail 1st Class Recorded delivery.

    Free European Delivery

bottom of page