The Titanium Field Guide

Proxima MM300 Titanium

The Proxima MM300 Titanium is a current-production diver watch with a Grade 5 titanium case, finished with brushed titanium monoblock. It is priced well under the $1,300 median for the category. Nothing touching the skin is nickel-bearing steel, verified across the case, caseback and bracelet.

Titanium diver watchesUnder $500MicrobrandGrade 5 titanium
Price
$335
Titanium
Grade 5
Water resistance
300 m
Nickel-free
Yes
Type
Diver
Case diameter
44.0 mm
Thickness
15.8 mm
Origin
China
Movement
Automatic
Caliber
Seiko NH35
Power reserve
41 h
Complications
Date
Case shape
Round
Case colour
Natural / grey
Finish technology
Natural finish
Surface treatment
Brushed titanium monoblock
Caseback
Titanium
Bracelet / strap
Titanium
Crystal
Sapphire
Display back
No
Dial
Black
Dial colours
Black
Lume
Super-LumiNova
Availability
Offered
Status
Current; final production batch; maker states Grade 5 titanium
Not published
Reference, Lug-to-lug, Weight, Titanium bracelet Help verify
Medium confidence Verified Jun 2026 Source: Proxima Maker / listing ↗
Facts are free to cite with a link.
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Frequently asked questions

Is the Proxima MM300 Titanium nickel-free?

Yes. Nothing nickel-bearing touches the skin: a Grade 5 titanium case with a titanium caseback, plus a non-steel crown and bracelet and clasp. The Titanium Field Guide marks it nickel-free for whole-watch skin contact. If your allergy is severe, confirm the contact points with the maker.

What grade of titanium is the Proxima MM300 Titanium?

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

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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