Tandorio 42mm Square NH35 Mechanical Dive Watch | Sapphire

Discover the perfect fusion of classic elegance and serious dive capability. The Tandorio 42mm Square Mechanical Watch is built for the discerning watch enthusiast who demands both style and substance. Powered by the legendary Japan NH35 automatic movement, housed in a precision-crafted 316L stainless steel square case, and protected by anti-reflective sapphire crystal glass on both the front and back — this timepiece is a collector-worthy statement on your wrist.

Made in Mainland China.

Why You'll Love This Watch

• Japan NH35 Automatic Movement — A workhorse calibre trusted by watchmakers worldwide for its accuracy and reliability. Self-winding and hand-wind capable.
• AR Sapphire Crystal Glass — Anti-reflective coating on both the front and back sapphire glass ensures crystal-clear dial legibility and a premium look from every angle.
• 150M / 10 Bar Water Resistance — Engineered for serious diving, swimming, and water sports. Screw-down crown ensures a watertight seal.
• 42mm Square 316L Stainless Steel Case — Bold, architectural square silhouette stands out from the crowd. At just 11.8mm thick, it wears comfortably on the wrist.
• Rotating GMT Chapter Ring — Controlled via the crown at the 4 o'clock position, adding functional flair for travellers and adventurers.
• Luminous Hands & Markers — Glow in low-light conditions so you always know the time, day or night, above or below the surface.
• Available in Black & Ice Blue Dials — Two striking colourways to match your personal style.
• Stainless Steel Bracelet with leather deployment buckle clasp — Secure, comfortable, and refined.
• 13mm Lug Width — Easy to strap swap for added versatility.
• Sapphire Glass Caseback — Showcase the intricate NH35 rotor spinning with every movement of your wrist.

Full Specifications

The NH35 Movement — Built to Last

The Seiko NH35A is one of the most respected automatic movements in the world. With 24 jewels, a 21,600 bph beat rate, and ±10 seconds/day accuracy, it powers countless professional-grade timepieces. The open caseback on this watch lets you admire the rotor in action — a true horological experience.

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For further information on standards and accuracy for mechanical watch movements, visit the NIST Time & Frequency Division — the official US standards authority for timekeeping.

Frequently Asked Questions

Q: What movement does the Tandorio 42mm square dive watch use?

A: It uses the Japan Seiko NH35A automatic movement, a highly regarded self-winding calibre with hand-wind capability, 24 jewels, and approximately ±10 seconds/day accuracy. The movement is visible through the sapphire caseback.

Q: How water-resistant is this mechanical dive watch?

A: This watch is rated to 150 metres (10 Bar) of water resistance, making it suitable for recreational scuba diving, snorkelling, swimming, and water sports. The screw-down crown ensures a watertight seal during submersion.

Q: What is the sapphire glass on the front and back?

A: Both the front crystal and the caseback are made from anti-reflective (AR) sapphire crystal glass — one of the hardest materials used in watchmaking (rated 9 on the Mohs scale). The AR coating minimises glare for better dial visibility, while the sapphire caseback lets you view the movement's rotor in action.

Q: What does the crown at 4 o'clock do?

A: The crown positioned at 4 o'clock is used to rotate the GMT chapter ring on the watch dial, allowing you to track a second time zone or use it as a countdown/elapsed time reference. The crown at 3 o'clock is used for standard time setting.

Q: Can I customise the watch with my own logo?

A: Yes! Tandorio offers custom logo engraving or printing on the dial for an additional fee. Please contact us before placing your order to discuss your customisation requirements.