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Model reference: 15710ST.OO.A002CA.01
Reference 15710ST.OO.A002CA.01, the 42 mm Royal Oak Offshore Diver with a black Méga Tapisserie dial, an internal sixty-minute dive scale and a black rubber strap.
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About this watch
This is the 42 mm Royal Oak Offshore Diver, reference 15710ST.OO.A002CA.01, shown with a black Méga Tapisserie dial on a black strap. The photographs settle the appearance: the squared dial texture, the applied markers, the printed block under the centre, the date at three o’clock, and a ring of dive numerals inside the crystal rather than on the bezel.
Two details are worth noticing before you read on. The case carries two crowns rather than one, because the timing scale is internal and is driven from the side of the case, and the octagonal bezel therefore stays fixed with its screws on show. Everything else the frames cannot answer — which movement is fitted, what the case and bezel are made from, which strap and buckle come with the piece, and what its water-resistance state is — is asked for in the inquiry list at the foot of this page.
On this reference the elapsed-time scale is printed on a ring that sits inside the crystal, around the outer edge of the dial. That leaves the bezel free to be the fixed octagonal ring with exposed screw heads that identifies the Offshore, rather than a part that turns. The numerals climb in ten-minute steps — 20, 30, 40 and 50 are legible in the frames — and the fine divisions between them are what you read against the minute hand.
The trade-off is where your eye has to go. On a classic diver you rotate a ring and read a marker on the outside of the case; here you look inside the glass, which keeps the scale clear of knocks but puts the numerals close to the dial texture, where they are less obvious at a glance. Whether the scale on the offered watch turns smoothly through its full sixty minutes, and whether it returns exactly to its start, is something to watch on video rather than infer from a still.
Méga Tapisserie is a raised grid of squares cut into the dial surface, larger and deeper than the small tapisserie used on other Royal Oaks. In the straight-on frame the surface reads as flat black and the pattern almost disappears; in the angled frame the walls of each square catch the light and the dial becomes a diagonal weave. That difference between two photographs of one dial is the pattern working, not two different dials.
The flat finish is what keeps the watch legible, because the printed block under the centre and the applied markers have to sit on top of that texture and still read. How crisp the pattern edges are on a particular watch is only visible up close, so ask for a frame at an angle in daylight instead of judging from a lit studio shot.
The hour markers are separate pieces set onto the dial: applied indices in a white-metal tone, on baton shapes, with a triangle at twelve o’clock. The hands belong to the same family — broad hour and minute hands with luminous fills and a slim centre seconds hand. Everything else is printed on the surface: the brand lettering above the centre, the two-line block beneath it, the minute divisions, the dive numerals on the inner ring and the line at the bottom of the dial.
That split is what you inspect first, because printed elements show wear or damage sooner than applied ones, while applied markers can be checked for sitting flat and for even spacing. In these frames the white print is clean and the markers sit level, but a still image cannot tell you whether the luminous material is intact across the whole dial, so ask for one photograph in dim light.
As specified, this reference uses the self-winding calibre 3120, running at 21,600 vibrations per hour with around 60 hours of power reserve, and it is described with a sapphire display back. Those are the published design parameters for the reference, and they are useful context rather than a description of any one watch.
The movement actually fitted to the piece you are offered is a separate matter, and it is where a catalogue page has no authority at all. Ask which movement is inside, ask for a photograph of the back, and confirm whether the back on that watch is a display back. If it is, the back gives you something concrete to judge from a clear photograph, which is worth more than any summary.
The case is 42 mm across and about 14.1 mm deep, which is substantial for that diameter and is part of what gives an Offshore its presence on the wrist. Depth, not diameter, is what decides whether a watch slides under a shirt cuff or sits on top of it, and on a strap rather than a bracelet the case tends to shift a little more as the wrist moves.
Two measurements answer a fit question better than the diameter on its own: lug-to-lug length and case thickness, taken together with your wrist circumference. None of them can be read off a ruler in a product photograph, so ask for them measured on the watch being offered before you decide whether 42 mm is right for you.
The bezel is held by hexagonal screw heads that sit flush in the octagonal ring, and the frame of the case flank also shows a screw head at the lug where the strap is fitted. They are a design signature, and they are also the parts an inspector checks first, because a screw that has been forced leaves a mark across its slot or sits proud of the surface it should be level with.
In these frames the screw heads read clean and evenly set, and the bezel edge shows the highlight you would expect from an angled shot. A still photograph cannot tell you whether every screw is tight, whether the heads line up the same way when you have the watch in front of you, or how the case flank behaves in daylight. Ask for a short video turning the watch slowly instead.
Specification
| Detail | Description |
|---|---|
| Model reference | 15710ST.OO.A002CA.01 |
| Model size | 42 mm |
| Dial | Black, Méga Tapisserie |
| Dial print | Brand lettering above the centre; depth rating and AUTOMATIC below |
| Hour-marker layout | Applied baton indices, triangle at twelve o’clock |
| Hand arrangement | Broad hour and minute hands, slim centre seconds |
| Date display | Aperture at three o’clock, no magnifier |
| Bezel design | Fixed octagonal ring with exposed hexagonal screw heads |
| Colour combination | Black dial, black strap, silver-tone case and bezel |
| Strap shown | Black rubber strap |
| Clasp | Steel pin buckle |
| Case back | Sapphire display back on the named reference |
| Movement (reference design) | Self-winding calibre 3120, 21,600 vph, about 60 hours |
Questions
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Six frames that answer more than a long description: daylight dial, bezel straight on, bracelet closed, clasp, case back and a short video of the moving parts.
Read the guide →A practical guide to model references, measurements, materials and the questions to ask when comparing watches.
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