The Titanium Field Guide

San Martin SN003-Q Bronze Tuna

The San Martin SN003-Q Bronze Tuna is a current-production diver watch with a cusn8 marine bronze case. It is priced well under the $1,299 median for the category.

All San Martin watchesExotic-material diver watchesUnder $500Microbrand
Price
$250
Material
Bronze
Grade / type
CuSn8 marine bronze
Water resistance
300 m
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
Finish technology
Natural finish
Caseback
Steel
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, Matching bracelet
High confidence Verified Sep 2026 Source: San Martin (maker product page) / SKB Watches Spec checksAlloy Jul 2026Price Jul 2026
Facts are free to cite with a link.
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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 is the case material of the San Martin SN003-Q Bronze Tuna?

The San Martin SN003-Q Bronze Tuna has a cusn8 marine 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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