The Wristwatch 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 $1,195 median for the category. Nothing touching the skin is nickel-bearing steel, verified across the case, caseback and bracelet.

All Proxima watchesExotic-material diver watchesBronzeDiversUnder $5,000
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
Caseback
Bronze
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, Matching bracelet
Medium confidence Verified Jul 2026 Source: WR Watches
Facts are free to cite with a link.
Reader reviews & photosContribute photo or review
No reviews yet.
See it in the interactive guideContribute a photo or review

Similar exotic-material watches

Steeldive SD1968S Bronze MM300 MonoblocSteeldiveSD1968S Bronze MM300 Monobloc$19944.0 mm17.2 mm thickDiversame category · same style · similar price · similar sizeSan Martin SN003-Q Bronze TunaSan MartinSN003-Q Bronze Tuna$25042.0 mm15.2 mm thickDiversame category · same style · similar price · similar sizeHeimdallr Bronze MM300HeimdallrBronze MM300$15944.0 mm15.5 mm thickDiversame category · same style · similar price · similar sizeHeimdallr Bronze 6105HeimdallrBronze 6105$19545.0 mm13.3 mm thickDiversame category · same style · similar price · similar sizeBaltany Bronze Diver S3016BaltanyBronze Diver S3016$19944.0 mm14.2 mm thick120 gDiversame category · same style · similar price · similar sizeHruodland Bronze AvengerHruodlandBronze Avenger$20043.0 mm13 mm thickDiversame category · same style · similar price · similar sizeSan Martin SN047 Bronze DiverSan MartinSN047 Bronze Diver$22744.0 mm13.5 mm thickDiversame category · same style · similar price · similar sizeAragon Enforcer Titanium 9015AragonEnforcer Titanium 9015$22944.0 mm16 mm thick181 gDiversame category · same style · similar price · similar size

Alternatives to the Proxima Bronze MM300

Watchdives WD007 Top Hat Sapphire TitaniumWatchdivesWD007 Top Hat Sapphire Titanium$19942.0 mmDiversame category · same style · shared complications · similar priceCronos L6006 Bronze Turtle DiverCronosL6006 Bronze Turtle Diver$22944.0 mmDiversame category · same style · shared complications · similar priceThorn T019 Vintage Titanium Automatic DiverThornT019 Vintage Titanium Automatic Diver$22945.0 mmDiversame category · same style · shared complications · similar priceSan Martin Retro Titanium Diver SN0125-TSan MartinRetro Titanium Diver SN0125-T$23942.0 mmDiversame category · same style · shared complications · similar priceApexRare Bronze Trident C65 HomageApexRareBronze Trident C65 Homage$25041.0 mm12.8 mm thickDiversame category · same style · shared complications · similar priceSeagull Ocean Series Colorful Titanium 41mmSeagullOcean Series Colorful Titanium 41mm$26941.0 mm12.8 mm thick74.4 gDiversame category · same style · shared complications · similar price

More exotic-material watches from Proxima

ProximaMM300 Titanium$33544.0 mm15.8 mm thickDiver
Proxima62MAS Bronze$14039.0 mmDiver
ProximaBronze 6200 MarineMaster–44.0 mm15.8 mm thickDiverProxima UD1685 Bronze Samurai DiverProximaUD1685 Bronze Samurai Diver$27842.0 mm14 mm thickDiverProxima Bronze 65ProximaBronze 65$24040.0 mm14 mm thickDiver

Frequently asked questions

Is the Proxima Bronze MM300 nickel-free?

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

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.

All exotic-material Proxima watches · Exotic-material diver watches · All 1,972 watches

Learn: Best Under $1,000 · Best Under $5,000 · Which Material? · Lightest Materials

Image & Trademark Policy · Terms & Conditions