Steeldive SD1970 Tuna Dive Watch — 200m Waterproof, Sapphire Crystal, NH35 Automatic

Compact, rugged and unmistakably marine — the Steeldive SD1970 "Tuna" is a stainless steel men’s dive watch built for everyday wear and serious underwater timekeeping. Featuring a reliable NH35 automatic movement, 200m water resistance, and scratch‑resistant sapphire crystal, this Tuna dive watch delivers professional features at an excellent value.

• Model: Steeldive Brand SD1970 (Tuna)
• Movement: Seiko NH35 automatic mechanical (self-winding + hacking)
• Case: Robust stainless steel Tuna-style case
• Water resistance: 200m / 20 ATM — ready for diving and water sports

Key features — built for the water, designed for life

• Sapphire crystal with anti-reflective coating for superior scratch resistance and clarity
• NH35 automatic mechanical movement: reliable, accurate, and serviceable worldwide
• 200m waterproof / water-resistant rating for surface water sports and recreational diving
• Uni-directional rotating bezel for safe dive timing
• Luminous hands and markers for low-light legibility underwater and at night
• Screw-down crown and solid case back to enhance water protection
• Brushed stainless steel bracelet with secure clasp; removable links for a custom fit

Why choose the Steeldive SD1970 Tuna dive watch?

• Professional look and durability without the premium price tag
• Automatic NH35 movement gives a mechanical feel — no batteries required
• High-visibility dial and durable sapphire crystal for everyday resilience
• Classic Tuna silhouette: bold, protective shroud and strong wrist presence
• Excellent choice for divers, watersports enthusiasts, and anyone who wants a rugged stainless steel men’s watch

Technical specifications

• Case diameter: (approx.) 44–47 mm (Tuna-style proportions)
• Case material: 316L stainless steel
• Crystal: Sapphire (scratch-resistant)
• Movement: Seiko NH35 automatic (21,600 bph, hacking, hand-wind)
• Water resistance: 200m / 20 ATM
• Bezel: Uni-directional dive bezel
• Luminosity: Super-LumiNova or similar high-visibility lume
• Strap: Stainless steel bracelet (quick-release or standard spring bars depending on variant)
• Weight: Substantial, solid-feeling stainless steel construction

What’s in the box

• Steeldive SD1970 Tuna dive watch
• Stainless steel bracelet (fitted)
• Warranty card / user manual (varies by seller)
• Extra links or strap tool (where included)

Care & maintenance

• Rinse with fresh water after saltwater exposure and dry thoroughly
• Service mechanical movement every 3–5 years for best performance
• Avoid extreme shocks and magnetic fields to maintain accuracy

Durable, dependable and designed for diving — add the Steeldive SD1970 Tuna automatic mechanical stainless steel men’s watch to your collection and enjoy a professional-grade 200m dive watch with sapphire crystal, NH35 reliability, and bold Tuna styling.

Buy now to upgrade to a true Tuna dive watch: Steeldive SD1970 — 200m, sapphire crystal, NH35 automatic.