The Wristwatch Field Guide

Makoto Boken 300M Titanium

The Makoto Boken 300M Titanium is a current-production diver watch with a grey grade 5 case. It measures 40.0 mm across, 11.5 mm thick, 47 mm lug to lug, and is water resistant to 300 m. Inside is the Miyota 90S5 automatic movement. Complications: Time only. Priced from $950 (pre-order from $805; ships Oct 2026). Brand origin: Canada.

Titanium and ceramic diver watchesTitaniumDiversUnder $5,000
Reference
–
Type
Diver
Price
$950 · pre-order from $805; ships Oct 2026
Case diameter
40.0 mm
Thickness
11.5 mm
Lug-to-lug
47 mm
Water resistance
300 m
Weight
–
Origin
Canada
Movement
Automatic
Caliber
Miyota 90S5
Power reserve
–
Complications
Time only
Material
Titanium
Grade / type
Grade 5
Colour
Grey
Hardness
–
Construction
–
Surface treatment
None
Caseback
Titanium
Nickel-free
Yes
Bracelet / strap
FKM rubber strap (titanium buckle)
Matching bracelet
–
Crystal
–
Display back
No
Dial
–
Lume
Super-LumiNova BGW9
Availability
Offered
Status
Pre-order (ships Oct 2026)
High confidence Verified Jul 2026 Source: Makoto Maker / listing ↗
Facts are free to cite with a link.
See it in the interactive guide

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Alternatives to the Makoto Boken 300M Titanium

HelsonShark Diver 38 Titanium$75038.0 mmDiversame category · same style · similar price · similar sizeLip Grande Nautic-Ski Automatique Titane 41mmLipGrande Nautic-Ski Automatique Titane 41mm$86341.0 mm115 gDiversame category · same style · similar price · similar sizeSeagull Ocean Series Pro Ice Wing Titanium 43mmSeagullOcean Series Pro Ice Wing Titanium 43mm$86943.0 mm13.5 mm thick110 gDiversame category · same style · similar price · similar sizeRedux & Co. HONNR A-9Redux & Co.HONNR A-9$99537.0 mm12.75 mm thickDiversame category · same style · similar price · similar sizeBaltic Aquascaphe TitaniumBalticAquascaphe Titanium$1,05041.0 mm13.3 mm thick55 gDiversame category · same style · similar price · similar size
CertinaDS Action Diver 40.5mm Titanium$1,06040.5 mm14.1 mm thick124 gDiversame category · same style · similar price · similar size

More titanium and ceramic watches from Makoto

Makoto ShibuyaMakotoShibuya$76639.0 mm11.5 mm thickField

Frequently asked questions

Is the Makoto Boken 300M 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 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 Makoto Boken 300M Titanium?

The Makoto Boken 300M Titanium has a grey grade 5 case with a titanium caseback. This is confirmed against the maker spec.

What size is the Makoto Boken 300M Titanium?

It is 40.0 mm in diameter, 11.5 mm thick, 47 mm lug to lug, and water resistant to 300 m.

How much does the Makoto Boken 300M Titanium cost, and is it available?

It is current-production and lists from $950.

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