Manufacturers of High Quality Military Watches Since 1974

MWC 21 Jewel 1980s Pattern 300m Automatic Military Divers Watch with Sapphire Crystal and a Black and a Grey NATO Strap



Product Details

Product Code: SUB/MILSSAU/MY

These diver's watches are a remake of a 1980s model we produced until around 35 years ago. The watch features a robust stainless steel case and is equipped with a high-performance automatic 21,600 bph 21-jewel self-winding movement. We have made several upgrades to the original design, including a shatter and scratch-resistant sapphire crystal and an increased water resistance rating. The dial and caseback are both unbranded (referred to in the military as sterile), giving the watch a clean, uncluttered appearance.

Historical and Technical Background:

This watch is based on a 1980 UK MOD specification for automatic diver's watches (DEF STAN 66-4 [Part 1] Issue 3). This specification called for a unidirectional bezel and a boldly marked dial with tritium paint and a mineral glass crystal. Although this watch is made in the spirit of the 1980 watches, it includes improvements such as the sapphire crystal and increased water resistance.

Key Features and Upgrades:

  • Movement: High-performance automatic 21,600 bph 21-jewel self-winding movement with a 40-hour reserve
  • Crystal: Shatter and scratch-resistant sapphire crystal with anti-reflective coating
  • Water Resistance: 300m / 1000ft
  • Design: Sterile dial and caseback for a clean appearance
  • Visibility: Uses Luminova for excellent nighttime visibility
  • Strap: 20mm NATO strap, with a variety of color options available for easy customization


  • Water Resistance: 300m / 1000ft
  • Crown: Screwdown locking
  • Caseback: Screw caseback
  • Dimensions:
    • Width: 45mm including the crown, 40mm excluding the crown
    • Thickness: 15mm
    • Crystal Diameter: 31mm
    • Lug to Lug: 49mm
  • Weight: 89.5g
  • Movement: 21-jewel 21,600 bph with a 40-hour reserve
  • Strap: 20mm NATO webbing strap
  • Packaging: Giftbox included

Benefits of Sapphire Crystal:

Many customers ask about the benefits of sapphire crystal over standard mineral crystal. Synthetic sapphire is extremely strong, shatter-resistant, and scratch-resistant, making it ideal for military and security personnel, police officers, and active outdoor enthusiasts. These groups account for over 70% of our customer base.

Our observations show that over 90% of incidents involving cracked watch crystals occur with mineral glass. Even hardened mineral crystals do not match the durability of sapphire. Sapphire crystals are strengthened through heat treatment to remove internal stresses and are then coated with two layers of anti-reflective coating. While sapphire crystals are more expensive, they offer superior longevity, resilience, and performance, justifying their use in higher-end watches.

These models represent excellent value and are very competitively priced for such a high-performance automatic watch. This watch combines the historical design and functional integrity of its predecessors with modern upgrades to meet the needs of today's professionals and enthusiasts.

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