The Wristwatch Field Guide

Steeldive SD1975S Bronze Tuna Diver

The Steeldive SD1975S Bronze Tuna Diver is a current-production diver watch with a cusn8 marine bronze case. At 103 g it sits around the middle for diver watches in the guide, and is priced well under the $1,195 median for the category.

All Steeldive watchesExotic-material diver watchesBronzeDiversUnder $5,000
Price
$189
Material
Bronze
Grade / type
CuSn8 marine bronze
Weight
103 g (head only)
Water resistance
300 m
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
Nickel-free
Not verified (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
Offered
Status
Current
Not published
Reference, Colour, Hardness, Surface treatment, Caseback, Matching bracelet
Medium confidence Verified Jul 2026 Source: Steeldive official store / The Time Bum
Facts are free to cite with a link.
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Frequently asked questions

What is the case material of the Steeldive SD1975S Bronze Tuna Diver?

The Steeldive SD1975S Bronze Tuna Diver has a cusn8 marine bronze case. It is recorded at medium confidence pending a maker-stated material.

What size is the Steeldive SD1975S Bronze Tuna Diver?

It is 47.5 mm in diameter, 15 mm thick, 44 mm lug to lug, and water resistant to 300 m.

How much does the Steeldive SD1975S Bronze Tuna Diver weigh?

About 103 g (head).

How much does the Steeldive SD1975S Bronze Tuna Diver cost, and is it available?

It is current-production and lists from $189.

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