Product Detailed Description

ZF Factory Audemars Piguet Royal Oak Offshore Diver 15720ST 42mm Watch

The ZF Factory Audemars Piguet Royal Oak Offshore Diver 15720ST combines a 42mm stainless steel case with a Cal.4308 automatic mechanical movement and a natural rubber strap with a quick-release system.

The watch provides hours, minutes, central seconds and a date display positioned at 3 o’clock. A sapphire crystal with anti-reflective coating protects the dial, while the steel exterior and rubber strap maintain the sports-oriented character of the Royal Oak Offshore Diver design.

The supplied specification lists water resistance at 300 meters.

42mm Stainless Steel Case

The Royal Oak Offshore Diver 15720ST features a 42mm stainless steel case.

The 42mm diameter gives the watch a substantial sports-watch presence while providing sufficient dial area for the primary hands, hour markers and 3 o’clock calendar display.

Stainless steel provides good durability for regular wear and creates a clear visual contrast with the natural rubber strap.

The case proportions also contribute to the robust appearance associated with the Offshore Diver collection.

Steel Bezel

This configuration features a stainless steel bezel, maintaining a consistent material relationship with the main case.

The steel construction gives the exterior a predominantly metallic appearance while providing durability for everyday use.

As with other exposed polished or brushed metal surfaces, contact with hard or abrasive objects should be minimized to reduce scratches and impact marks.

Cal.4308 Automatic Movement

The ZF Factory Royal Oak Offshore Diver 15720ST is equipped with a Cal.4308 automatic mechanical movement configuration.

The supplied functions include:

Hours
Minutes
Central seconds
Date

Automatic winding allows normal wrist movement to replenish the movement’s stored energy during regular wear.

If the watch has remained unworn and stopped, the movement can be manually wound before setting the time and calendar.

Mechanical accuracy can vary depending on movement regulation, power reserve, temperature, resting position and individual wearing habits.

Date Display at 3 O’Clock

The watch features a date window positioned at 3 o’clock.

This provides an easily identifiable calendar reference while keeping the central section of the dial available for the hour, minute and seconds hands.

The side-positioned calendar is integrated into the sports-oriented dial architecture without requiring an additional subdial.

When manually adjusting the calendar, operate the setting mechanism gently and avoid forcing it if unusual resistance is encountered.

Central Seconds Display

Running seconds are indicated through a central seconds hand.

Together with the hour and minute hands, this creates a straightforward three-hand time display with the calendar positioned separately at 3 o’clock.

The moving seconds hand also provides an immediate visual reference that the automatic mechanical movement is operating.

Sapphire Crystal with Anti-Reflective Coating

The dial is protected by a sapphire crystal with anti-reflective coating.

Sapphire provides excellent optical transparency and high resistance to everyday surface scratches.

The anti-reflective treatment helps reduce glare and improves visibility of the dial, hands, hour markers and calendar window under different lighting conditions.

Strong direct impacts against hard surfaces should still be avoided.

Natural Rubber Quick-Release Strap

One of the practical features of this 15720ST configuration is its natural rubber strap with a quick-release system.

The quick-release structure allows the strap to be removed or changed more conveniently than a conventional strap installation that requires separate tools.

Natural rubber provides flexibility and good resistance to everyday moisture, complementing the sports-oriented construction of the Offshore Diver.

Correct strap adjustment helps keep the 42mm case secure and comfortable on the wrist.

Stainless Steel Pin Buckle

The rubber strap is secured using a stainless steel pin buckle.

The traditional buckle structure allows the wearing length to be adjusted through the available strap holes.

Its stainless steel construction also coordinates visually with the steel case and bezel.

The buckle and strap attachment points should be inspected periodically for excessive wear or looseness.

300m Water-Resistance Specification

The supplied specification lists the Royal Oak Offshore Diver 15720ST with 300 meters of water resistance.

Actual water resistance depends on the assembly and condition of the crown, seals, crystal, caseback and other components.

A supplied 300m specification should not automatically be interpreted as confirmation that every individual watch has passed an independent pressure test to that depth.

Professional pressure testing is recommended before swimming, diving or other intentional underwater use.

Product Specifications
Item Specification
Factory ZF Factory
Brand Audemars Piguet
Collection Royal Oak Offshore Diver
Reference 15720ST
Case Size 42mm
Case Material Stainless Steel
Bezel Stainless Steel
Movement Cal.4308 Automatic
Functions Hours, Minutes, Central Seconds, Date
Date Position 3 O’Clock
Crystal Sapphire Crystal
Crystal Treatment Anti-Reflective Coating
Water Resistance 300m Specification
Strap Natural Rubber
Strap System Quick Release
Buckle Stainless Steel Pin Buckle
Style Automatic Dive / Sports Watch
Wearing and Care Advice

Clean the stainless steel case and buckle periodically using a clean, soft microfiber cloth. Avoid aggressive polishing because repeated polishing can gradually alter the original surface finishing.

The natural rubber strap can be cleaned gently with fresh water and should be dried thoroughly afterward.

When changing the quick-release strap, make sure both attachment points are fully secured before wearing the watch.

Protect the Cal.4308 automatic movement from heavy impacts and strong magnetic fields.

When adjusting the 3 o’clock date display, operate the setting mechanism gently and avoid forcing the calendar.

Professional pressure testing is recommended before relying on the supplied 300m specification for intentional underwater use.

Frequently Asked Questions
What size is the ZF Factory AP 15720ST?

This Royal Oak Offshore Diver configuration features a 42mm stainless steel case.

What movement does the 15720ST use?

The supplied specification identifies a Cal.4308 automatic mechanical movement.

Where is the date window positioned?

The date display is located at 3 o’clock.

What type of crystal is used?

The watch features a sapphire crystal with anti-reflective coating.

Does the 15720ST have a quick-release strap?

Yes. This configuration uses a natural rubber strap with a quick-release system, allowing easier strap removal and replacement.

What type of buckle does the rubber strap use?

The strap is secured with a stainless steel pin buckle.

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