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 measures 44.0 mm across, 15.8 mm thick, 50 mm lug to lug, and is water resistant to 300 m. Inside is the NH35 japanese automatic (seiko tmi) movement, with 41 hours power reserve. Complications: Date. Priced from $259 (from, varies by configuration). Brand origin: China.

Bronze diver watchesCuSn8DiversUnder $500
Reference
–
Type
Diver
Price
$259 · from, varies by configuration
Case diameter
44.0 mm
Thickness
15.8 mm
Lug-to-lug
50 mm
Water resistance
300 m
Weight
–
Origin
China
Movement
Japanese automatic (Seiko TMI)
Caliber
NH35
Power reserve
41 hours
Complications
Date
Ceramic
CuSn8 marine bronze
Colour
–
Hardness
–
Construction
Assembled
Surface treatment
–
Caseback
Bronze
Nickel-free
Yes
Bracelet / strap
Rubber or leather strap (buyer choice)
Ceramic bracelet
–
Crystal
Sapphire with anti-reflective coating
Display back
No
Dial
Brown, green, silver and other variants
Lume
Super-LumiNova
Availability
Offered
Status
Current
Medium confidence Verified Jul 2026 Source: WR Watches Maker / listing ↗
Facts are free to cite with a link.
See it in the interactive guide

Similar bronze 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 size
HeimdallrBronze 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 thickDiversame category · same style · similar price · similar sizeHruodland Bronze AvengerHruodlandBronze Avenger$20043.0 mm13 mm thickDiversame category · same style · similar price · similar size
San MartinSN047 Bronze Diver$22744.0 mm13.5 mm thickDiversame category · same style · similar price · similar size
CronosL6006 Bronze Turtle Diver$22944.0 mmDiversame category · same style · similar price · similar size

Alternatives to the Proxima Bronze MM300

ApexRareBronze Trident C65 Homage$25041.0 mm12.8 mm thickDiversame category · same style · shared complications · similar priceHruodland Bronze Diver HomageHruodlandBronze Diver Homage$31543.0 mm13 mm thickDiversame category · same style · shared complications · similar price
HeimdallrH1 Bronze Tuna$19947.0 mm14.5 mm thick160 gDiversame category · same style · similar price · similar size
ShirryuBronze Diver$22941.0 mm15 mm thickDiversame category · same style · similar price · similar sizeSan Martin CuSn8 Bronze Diver 42mmSan MartinCuSn8 Bronze Diver 42mm$24242.0 mm11.6 mm thick100 gDiversame category · same style · similar price · similar size
MerkurSEIZENN Pure Bronze CuSn8 Pro Diver 600M$24944.0 mm14 mm thickDiversame category · same style · similar price · similar size

More bronze watches from Proxima

Proxima62MAS Bronze$14039.0 mmDiver
ProximaBronze 6200 MarineMaster–44.0 mm15.8 mm thickDiver
ProximaUD1685 Bronze Samurai Diver$27842.0 mm14 mm thickDiver
ProximaBronze 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 (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.

All bronze Proxima watches · Bronze diver watches · All 304 watches

Learn: Bronze Alloys · Patina · Green Wrist · Bronze vs Steel