The Wristwatch Field Guide

Proxima MM300 Titanium

The Proxima MM300 Titanium is a current-production diver watch with a grey grade 5 case, finished with brushed titanium monoblock. It measures 44.0 mm across, 15.8 mm thick, and is water resistant to 300 m. Inside is the Seiko NH35 automatic movement, with 41 h power reserve. Complications: Date. Priced from $335 (maker storefront; final batch). Brand origin: China.

Titanium and ceramic diver watchesTitaniumDiversUnder $5,000
Reference
–
Type
Diver
Price
$335 · maker storefront; final batch
Case diameter
44.0 mm
Thickness
15.8 mm
Lug-to-lug
–
Water resistance
300 m
Weight
–
Origin
China
Movement
Automatic
Caliber
Seiko NH35
Power reserve
41 h
Complications
Date
Material
Titanium
Grade / type
Grade 5
Colour
Grey
Hardness
–
Construction
–
Surface treatment
Brushed titanium monoblock
Caseback
Titanium
Nickel-free
Yes
Bracelet / strap
Titanium
Matching bracelet
–
Crystal
Sapphire
Display back
No
Dial
Black
Lume
Super-LumiNova
Availability
Offered
Status
Current; final production batch; maker states Grade 5 titanium
Medium confidence Verified Jun 2026 Source: Proxima Maker / listing ↗
Facts are free to cite with a link.
See it in the interactive guide

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Alternatives to the Proxima MM300 Titanium

Seagull Ocean Series Colorful Titanium 41mmSeagullOcean Series Colorful Titanium 41mm$26941.0 mm12.8 mm thick74.4 gDiversame category · same style · shared complications · similar priceHamtun Kraken H3HamtunKraken H3$31541.0 mmDiversame category · same style · shared complications · similar priceHelm Vanuatu TitaniumHelmVanuatu Titanium$35042.0 mm14 mm thick145 gDiversame category · same style · shared complications · similar priceMaranez Samui Diver TitaniumMaranezSamui Diver Titanium$39942.0 mm123 gDiversame category · same style · shared complications · similar priceMaranez Samui Vintage TitaniumMaranezSamui Vintage Titanium$39942.0 mm124 gDiversame category · same style · shared complications · similar priceSignum Cuda TitaniumSignumCuda Titanium$39942.5 mm13.4 mm thick79 gDiversame category · same style · shared complications · similar price

Frequently asked questions

Is the Proxima MM300 Titanium nickel-free?

Yes. Nothing nickel-bearing touches the skin: a grey grade 5 case with a titanium caseback, plus a non-steel crown and bracelet and clasp. 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 MM300 Titanium?

The Proxima MM300 Titanium has a grey grade 5 case with a titanium caseback. It is recorded at medium confidence pending a maker-stated material.

What size is the Proxima MM300 Titanium?

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

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

It is current-production and lists from $335.

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