Blue dial, 300 meters of water resistance, and a movement that beats at 28,800 vph. The replica royal oak offshore 15720ST blue is the current Offshore Diver in the color that AP does best — a rich blue on the Mega Tapisserie surface that shifts between navy and electric depending on how the light hits. The 42mm steel case, inner rotating dive bezel, and Cal. 4308 make this a proper tool watch that happens to look expensive.
Blue Dial on Mega Tapisserie
AP has used blue on the Royal Oak since the original 5402 in 1972, but the Offshore Diver does something different with the color. The Mega Tapisserie pattern — larger and bolder than the Royal Oak’s Grande Tapisserie — creates deeper wells of shadow across the dial surface. In blue, this produces a dimensional effect where the dial appears to change shade as you move your wrist. Under direct light, the raised portions almost glow; in shade, they darken to near-black.
The luminous hour markers and hands are oversized compared to the Royal Oak proper, which is a concession to underwater legibility. The date window at three o’clock is framed with a slight recess rather than a raised cyclops. At 14.1mm thick, the case has genuine presence on the wrist without the bulk of the 44mm chronograph models.
Comparing Offshore Diver Colors
The 15720ST comes in several dial options, and blue tends to be the most versatile. The khaki green version reads more military, the black version disappears into the strap, but the blue carries enough personality to stand out while remaining appropriate for non-dive contexts. It is the version most people choose for a single Offshore Diver.
Caliber 4308 inside this replica royal oak offshore 15720ST blue provides 60 hours of power reserve and a 4Hz beat rate. The seconds hand completes each sweep in smooth increments — useful when timing decompression stops against the inner rotating bezel. The blue rubber strap is the quick-change type, letting you swap without tools. See all available divers in the Offshore section, or review our return policy before ordering.
| Reference | 15720ST.OO.A027CA.01 |
| Case | 42mm · Stainless steel |
| Bezel | Octagonal · 8 hexagonal screws |
| Dial | Blue · Mega Tapisserie · Luminous markers |
| Crystal | Sapphire · AR coating |
| Caliber | 4308 · Automatic · 60h reserve |
| Strap | Blue rubber · quick-change system |
| Buckle | Stainless steel · AP folding clasp |
| Water | 300m / 30 ATM |
| Functions | Hours, minutes, seconds, date, inner rotating bezel |
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