The Titanium Field Guide

San Martin SN027-T3 Grade 5 Titanium Diver 43mm

The San Martin SN027-T3 Grade 5 Titanium Diver 43mm is a current-production diver watch with a Grade 5 titanium case, finished with brushed. At 86 g it sits around the middle for diver watches in the guide, and 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 $500MicrobrandLightweightLightest, rankedGrade 5 titaniumTitanium bracelet available
Price
$350
Titanium
Grade 5
Weight
86 g (with bracelet)
Water resistance
200 m
Nickel-free
Yes
Type
Diver
Case diameter
43.0 mm
Thickness
12.5 mm
Lug-to-lug
51 mm
Origin
China
Movement
Automatic
Caliber
Seagull ST2100
Power reserve
60 h
Complications
Date
Case shape
Round
Case colour
Natural / grey
Finish technology
Natural finish
Surface treatment
Brushed
Caseback
Titanium
Bracelet / strap
Titanium bracelet or leather strap
Titanium bracelet
Optional (or strap)
Crystal
Sapphire, AR coated
Display back
No
Dial
Grey
Dial colours
Grey
Lume
BGW9 Super-LumiNova
Availability
Offered
Status
Current
Not published
Reference
High confidence Verified Jul 2026 Source: San Martin (maker) Maker / listing ↗
Facts are free to cite with a link.
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Frequently asked questions

Is the San Martin SN027-T3 Grade 5 Titanium Diver 43mm nickel-free?

Yes. Nothing nickel-bearing touches the skin: a Grade 5 titanium case with a titanium caseback, plus a non-steel crown and strap. 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 San Martin SN027-T3 Grade 5 Titanium Diver 43mm?

The San Martin SN027-T3 Grade 5 Titanium Diver 43mm has a Grade 5 titanium case with a titanium caseback. This is confirmed against the maker spec.

What size is the San Martin SN027-T3 Grade 5 Titanium Diver 43mm?

It is 43.0 mm in diameter, 12.5 mm thick, 51 mm lug to lug, and water resistant to 200 m.

How much does the San Martin SN027-T3 Grade 5 Titanium Diver 43mm weigh?

About 86 g (w/ bracelet).

How much does the San Martin SN027-T3 Grade 5 Titanium Diver 43mm cost, and is it available?

It is current-production and lists from $350.

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