The Wristwatch 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 grey grade 5 case, finished with brushed. It measures 43.0 mm across, 12.5 mm thick, 51 mm lug to lug, 86 g, and is water resistant to 200 m. Inside is the Seagull ST2100 automatic movement, with 60 h power reserve. Complications: Date. Priced from $350 (USD 350 (list 510)). Brand origin: China.

Titanium and ceramic diver watchesTitaniumDiversUnder $5,000
Reference
Type
Diver
Price
$350 · USD 350 (list 510)
Case diameter
43.0 mm
Thickness
12.5 mm
Lug-to-lug
51 mm
Water resistance
200 m
Weight
86 g (with bracelet)
Origin
China
Movement
Automatic
Caliber
Seagull ST2100
Power reserve
60 h
Complications
Date
Material
Titanium
Grade / type
Grade 5
Colour
Grey
Hardness
Construction
Surface treatment
Brushed
Caseback
Titanium
Nickel-free
Yes
Bracelet / strap
Titanium bracelet or leather strap
Matching bracelet
Optional (or strap)
Crystal
Sapphire, AR coated
Display back
No
Dial
Multiple; titanium bezel
Lume
BGW9 Super-LumiNova
Availability
Offered
Status
Current
High confidence Verified Jul 2026 Source: San Martin (maker) Maker / listing ↗
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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 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 San Martin SN027-T3 Grade 5 Titanium Diver 43mm?

The San Martin SN027-T3 Grade 5 Titanium Diver 43mm has a grey grade 5 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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