The Bronze Field Guide

Proxima Bronze MM300

The Proxima Bronze MM300 is a current-production diver watch with a cusn8 marine bronze (copper-tin) case. It is priced well under the $599 median for the category. Nothing touching the skin is nickel-bearing steel, verified across the case, caseback and bracelet.

All Proxima watchesBronze diver watchesCuSn8DiversUnder $500
Price
$259
Alloy
CuSn8 marine bronze
Water resistance
300 m
Caseback
Bronze
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
Nickel-free
Yes
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, Bronze 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?

Yes. Nothing nickel-bearing touches the skin: a cusn8 marine bronze (copper-tin) case with a bronze caseback, plus a non-steel crown and strap. The Bronze Field Guide marks it nickel-free for whole-watch skin contact. If your allergy is severe, confirm the contact points with the maker.

What bronze alloy is the Proxima Bronze MM300?

The Proxima Bronze MM300 has a cusn8 marine bronze (copper-tin) case with a bronze caseback. It is recorded at medium confidence pending a maker-stated alloy.

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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