The black satin-brushed dial is partially skeletonized to reveal the inner workings of the watch. But because they’re rather chunky, telling the timing isn’t overly hard, but legibility is not ideal. That being said, this isn’t actually a bit where the hands will be the focus. The running seconds hand for your chronograph is glowing yellow to provide contrast against the dark dial.Finally, the individual minute markers and the mark for the 30-minute chronograph at 3 o’clock are rendered in yellow and white to offer maximum contrast and legibility. The 30-minute counter at 3 o’clock is also exceptional since it displays the elapsed minutes using a retrograde indicator. And lastly, at six o’clock is that the tourbillon.The motion is where the magic all occurs. It is obviously in-house, also it’s the calibre 2937. And like all high-end chronograph movements, it has a column-wheel and lateral clutch.What’s odd about it, however, is both gongs. Rather than mounting the gongs into the motion plate, they are attached to what Audemars Piguet calls a “sound board.” Essentially, it’s a thin membrane made from a special aluminum alloy which covers the back of the movement, held in place with screws, and also forming a water-tight seal. This clarifies how the Royal Oak Concept Supersonnerie Tourbillon Chronograph watch can get a water-resistance rating of 20 meters, which may not seem like much to some casual observer, but that couldn’t be more incorrect. The 20 meters is actually quite impressive considering the intricate structure of the watch.
Last year Audemars Piguet Royal Oak Watch Snob Replica unveiled a slew of Royal Oak watches in yellow gold, with a notable omission, the Royal Oak Extra-Thin “Jumbo”. As the Royal Oak marks the 40th anniversary of the first yellow gold model of 1977, that has now been rectified with a pair that will make their debut at SIHH 2017.
The new Royal Oak Extra-Thin watches in 18k yellow gold join the 50-piece limited edition made for Singapore retailer The Hour Glass last year, with both the case and bracelet in yellow gold.
While the version for The Hour Glass had a green dial, the two new additions to the collection are in dark blue and yellow gold respectively. Both dials are finished in the traditional style of the Royal Oak, decorated with Petite Tapisserie guilloche and featuring yellow gold applied markers and hands.
The case diameter is 39mm, the exact same diameter as the 1977 original “Jumbo”, though the sapphire display back means the modern iteration is slightly thicker than the solid back original.
But the movement inside remains the 2121, the slim, self-winding calibre originally developed by Jaeger-LeCoultre but now made by Audemars Piguet.
Price and availability
The Royal Oak Extra-Thin in yellow gold with a blue dial is the ref. 15202BA.OO.1240BA.01, while the same with a matching yellow gold dial is the ref. 15202BA.OO.1240BA.02. Both are priced at US$55,400.