Steeldive SD1975S Bronze Tuna Diver
The Steeldive SD1975S Bronze Tuna Diver was a 47.5 mm bronze dive watch with a Seiko NH35 automatic movement. At 47.5 mm across, it is larger than 98% of the 203 bronze dive watches in the guide. It is no longer made, so this page is a reference for buying one used.
- Type
- Diver
- Case diameter
- 47.5 mm
- Thickness
- 15 mm
- Lug-to-lug
- 44 mm
- Origin
- China
- Movement
- Automatic
- Caliber
- Seiko NH35
- Power reserve
- 41 hours
- Complications
- Time only
- Construction
- Assembled
- Finish technology
- Natural finish
- Nickel-free
- Unconfirmed (contact-point materials not all confirmed)
- Bracelet / strap
- Leather or rubber strap with bronze buckle
- Crystal
- Single domed sapphire
- Display back
- No
- Dial
- Black (MarineMaster homage)
- Dial colours
- Black
- Lume
- Super-LumiNova C3 and BGW9
- Availability
- No longer offered
- Status
- Retired by the maker (re-read 2026-10-17: the cited url returns 404; SD1975S is absent from steeldives.com's product feed, 40 products, and from its US and en-au product sitemaps, 41 urls each, where the only bronze left is the SD1949S and SD1987S on clearance; also absent from the six owned Steeldive cluster stores)
- Not published
- Reference, Colour, Hardness, Surface treatment, Caseback, Matching bracelet
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Frequently asked questions
What is the case of the Steeldive SD1975S Bronze Tuna Diver made of?
The case is cusn8 marine bronze. The guide has not yet confirmed it on the maker's own page.
What size is the Steeldive SD1975S Bronze Tuna Diver?
The case is 47.5 mm across, 15 mm thick and 44 mm from lug to lug. It is water resistant to 300 m.
How much does the Steeldive SD1975S Bronze Tuna Diver weigh?
About 103 g for the watch head alone.
How much does the Steeldive SD1975S Bronze Tuna Diver cost, and is it available?
It is no longer made, so the only way to buy one is used. Its list price when it was in production was $189.
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