The Bronze Field Guide

San Martin SN003-Q Bronze Tuna

The San Martin SN003-Q Bronze Tuna is a current-production diver watch with a cusn8 bronze case. It is priced well under the $599 median for the category.

All San Martin watchesBronze diver watchesCuSn8Skin-safe backDiversUnder $500
Price
$250
Alloy
CuSn8 marine bronze
Water resistance
300 m
Caseback
Steel
Type
Diver
Case diameter
42.0 mm
Thickness
15.2 mm
Origin
China
Movement
Seiko NH36 automatic
Caliber
NH36
Power reserve
41 hours
Complications
Date
Construction
Assembled
Nickel-free
No (steel contact)
Bracelet / strap
Rubber strap
Crystal
Sapphire
Display back
No
Dial
Black, green, and blue colourways
Dial colours
Black Blue Green
Lume
SuperLuminova
Availability
Offered
Status
Current
Not published
Reference, Lug-to-lug, Weight, Colour, Hardness, Surface treatment, Bronze bracelet
High confidence Verified Jul 2026 Source: SKB Watches Maker ↗
Facts are free to cite with a link.
See it in the interactive guide

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Frequently asked questions

Is the San Martin SN003-Q Bronze Tuna nickel-free?

No. At least one part that touches the skin is nickel-bearing steel (commonly the caseback or clasp), so the guide does not mark it nickel-free.

What bronze alloy is the San Martin SN003-Q Bronze Tuna?

The San Martin SN003-Q Bronze Tuna has a cusn8 bronze case, though its caseback is steel. This is confirmed against the maker spec.

What size is the San Martin SN003-Q Bronze Tuna?

It is 42.0 mm in diameter, 15.2 mm thick, and water resistant to 300 m.

How much does the San Martin SN003-Q Bronze Tuna cost, and is it available?

It is current-production and lists from $250.

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