The Bronze Field Guide

Steeldive SD1975S Bronze Tuna Diver

The Steeldive SD1975S Bronze Tuna Diver is a current-production diver watch with a cusn8 bronze case. At 103 g it sits among the lighter diver watches in the guide, and is priced well under the $599 median for the category.

All Steeldive watchesBronze diver watchesCuSn8DiversUnder $500
Price
$189
Alloy
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, Bronze bracelet
Medium confidence Verified Jul 2026 Source: Steeldive official store / The Time Bum
Facts are free to cite with a link.
See it in the interactive guide

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Frequently asked questions

What bronze alloy is the Steeldive SD1975S Bronze Tuna Diver?

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

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.

All bronze Steeldive watches · Bronze diver watches · All 319 watches

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