ZF Edition — Grey Rubber Quick-Change Strap
The Royal Oak Offshore Diver reference 15720ST represents a significant evolution in Audemars Piguet’s dive watch lineage, and this ZF iteration captures its robust architecture with clinical precision. Recognized across enthusiast forums for its superior Méga Tapisserie dial texture and accurate case geometry, this specific release addresses the dimensional flaws present in earlier generation replicas. The integration of the 2021-spec quick-change strap system demonstrates ZF’s commitment to modern Offshore functionality.
Powering this reference is the clone Calibre 4308, engineered to replicate the genuine movement’s operational behavior, including the instant date jump at midnight. Operating at a high-beat 28,800vph, the mechanism provides a smooth sweep of the seconds hand while maintaining correct balance wheel positioning at 8 o’clock. As with most complex clone calibers in this tier, the power reserve yields approximately 36 hours of continuous operation.
The 42mm 316L stainless steel case exhibits the mandatory brushed/polished alternating finishing that defines the Royal Oak family. The grey dial features applied white gold-plated markers filled with luminous compound, surrounded by the signature internal rotating dive ring controlled via the 10 o’clock ceramic crown. The proprietary interchangeable strap system allows for seamless transitions without the need for specialized horological tools.
- Movement: Clone Calibre 4308 — Approximately 36 hours
- Case Material: 316L Stainless Steel, 42mm diameter, ~14.2mm thickness
- Bezel: Internal rotating dive ring with 60-minute graduation
- Crystal: Sapphire with colorless anti-reflective coating
- Bracelet: Grey rubber strap with quick-change interchangeable system
- Water Resistance: 50m stated — a professional water-resistance check is recommended before submersion. Avoid using the pushers or crown while the watch is under water.
Designed for the collector who appreciates substantial wrist presence and technical dive watch aesthetics. This piece serves as a highly capable mechanical alternative for weekend wear and casual environments.


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