San Martin SN0121T — Grade 5 Titanium Dive Watch

Some watches tell time. The San Martin SN0121T tells a story — one of precision engineering, featherlight endurance, and understated elegance that moves effortlessly from the ocean floor to the boardroom. Crafted from aerospace-grade Grade 5 titanium, this 39mm automatic diver is built for those who demand performance without compromise and style without effort.

At just 100.5g, the SN0121T disappears on your wrist — yet its presence is undeniable. The matte ceramic bezel glows with BGW-9 blue luminescence, the sapphire crystal catches light with quiet confidence, and the screw-down crown bears a signature 3D hexagon logo that speaks to the craft behind every detail. Whether you're exploring the depths at 300 metres or navigating a dinner reservation, this watch is always exactly where it belongs.

Available with your choice of NH35 or PT5000/ST2130 automatic movement — both regulated in-house for accuracy, both backed by a 2-year warranty. This is the dive watch refined collectors reach for.

Key Features

• Grade 5 Titanium Case & Bracelet — 50% stronger than Grade 2, hypoallergenic, and remarkably lightweight at 100.5g
• 300M / 30 BAR Water Resistance — screw-down crown and case back rated for serious diving
• Sapphire Crystal Glass with AR Coating — scratch-resistant with anti-reflective clarity
• 120-Click Unidirectional Matte Ceramic Bezel — BGW-9 luminous markers for precise dive timing
• Full BGW-9 Lume System — illuminated dial, hands, and bezel for 360° low-light visibility
• NH35 or PT5000/ST2130 Automatic Movement — 28,800 bph, regulated to -10~+20 sec/day, 41-hour power reserve
• Fly Adjustment Clasp — tool-free micro-adjustment for a perfect fit every time
• 39mm Diameter | 47mm Lug-to-Lug | 12.8mm Thickness — a versatile size that wears elegantly on most wrists

Watch Specifications — SN0121T-GA (NH35)

• Movement: NH35 Automatic Mechanical
• Case: Grade 5 Titanium, Round, 39mm
• Glass: Sapphire Crystal, AR Coating
• Bezel: 120-click unidirectional matte ceramic, BGW-9 luminous
• Dial: Matte Black / Matte Blue (numberless)
• Crown: Screw-down, 3D Hexagon Logo
• Case Back: Screw-down, brushed finish
• Bracelet: Grade 2 Titanium, brushed front / polished side, 20mm width
• Clasp: Grade 2 Titanium folding clasp with safety & fly adjustment
• Water Resistance: 30 BAR / 300M
• Lug-to-Lug: 47mm | Thickness: 12.8mm | Weight: 100.5g

Watch Specifications — SN0121T-GD (PT5000 / ST2130)

• Movement: PT5000 or ST2130 Automatic Mechanical (28,800 bph)
• Case: Grade 5 Titanium, Round, 39mm
• Glass: Sapphire Crystal, AR Coating
• Bezel: 120-click unidirectional matte ceramic, BGW-9 luminous
• Dial: Matte Black / Matte Blue (numberless)
• Crown: Screw-down, 3D Hexagon Logo
• Case Back: Screw-down, brushed finish
• Bracelet: Grade 2 Titanium, brushed front / polished side, 20mm width
• Clasp: Grade 2 Titanium folding clasp with safety & fly adjustment
• Water Resistance: 30 BAR / 300M
• Lug-to-Lug: 47mm | Thickness: 11.6mm | Weight: 100.5g

A Note on Movement Availability

Q: Is switching to ST2130 a cost-cutting move?
Not at all — the ST2130 actually costs us slightly more. The change is due to industry-wide PT5000 shortages. We chose the ST2130 to ensure stable supply and consistent quality, not to reduce costs.

Q: Is the ST2130 worse than the PT5000?
Different, not worse. Both are 28,800 bph high-frequency movements with identical smooth sweeping. The ST2130 is a proven workhorse with decades of reliability, regulated by us to -10~+20 sec/day and backed by our 2-year warranty.

Q: When will the PT5000 return?
The shortage is industry-wide and the timeline remains unpredictable. You're welcome to join our waiting list — no payment required upfront. Or, if you need a watch now, the ST2130 won't disappoint.

In the Box

Watch · Presentation Box · Warranty Card · User Manual

Our Promise

• 2-Year Warranty
• Returns & exchanges — see our Return / Exchange / Warranty Policy
• Retail, wholesale, OEM/ODM available — contact us for details

Care & Usage Notes

Water inside the watch? Minor condensation will typically dissipate on its own. If water droplets are visible inside, please have the watch serviced promptly.

Automatic winding: Wear the watch at least 8 hours daily for consistent timekeeping. Manual winding (15 clockwise turns without pulling the crown) can supplement energy when needed.

Date adjustment: Avoid adjusting the date between 8:00 PM and 4:00 AM to prevent damage to the calendar mechanism. Keep the watch away from strong magnetic fields (televisions, computers).