The Titanium Field Guide

Proxima Bronze MM300

The Proxima Bronze MM300 is a current-production diver watch with a cusn8 marine bronze case. It is priced well under the $1,299 median for the category. The maker states no nickel-bearing steel at any skin-contact point, across the case, caseback and bracelet.

All Proxima watchesExotic-material diver watchesUnder $500Microbrand
Price
$259
Material
Bronze
Grade / type
CuSn8 marine bronze
Water resistance
300 m
Type
Diver
Case diameter
44.0 mm
Thickness
15.8 mm
Lug-to-lug
50 mm
Origin
China
Movement
Japanese automatic (Seiko TMI)
Caliber
NH35
Power reserve
41 hours
Complications
Date
Construction
Assembled
Finish technology
Natural finish
Caseback
Bronze
Nickel-free
Maker states none
Bracelet / strap
Rubber or leather strap (buyer choice)
Crystal
Sapphire with anti-reflective coating
Display back
No
Dial
Brown, green, silver and other variants
Dial colours
Silver Green Brown
Lume
Super-LumiNova
Availability
Offered
Status
Current
Not published
Reference, Weight, Colour, Hardness, Surface treatment, Matching bracelet
Medium confidence Verified Jul 2026 Source: WR Watches
Facts are free to cite with a link.
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Frequently asked questions

Is the Proxima Bronze MM300 nickel-free?

On the maker's published specification, no nickel-bearing steel touches the skin: a cusn8 marine bronze case with a bronze caseback, plus a non-steel crown and strap. That is what the guide records rather than a test of the watch, so confirm the contact points with the maker before buying if you react to nickel.

What is the case material of the Proxima Bronze MM300?

The Proxima Bronze MM300 has a cusn8 marine bronze case with a bronze caseback. It is recorded at medium confidence pending a maker-stated material.

What size is the Proxima Bronze MM300?

It is 44.0 mm in diameter, 15.8 mm thick, 50 mm lug to lug, and water resistant to 300 m.

How much does the Proxima Bronze MM300 cost, and is it available?

It is current-production and lists from $259.

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