The Royal Oak Selfwinding ref. 15400ST is the 41 mm stainless-steel Royal Oak (2012–2019) with the octagonal bezel, exposed hexagonal screws, 'Grande Tapisserie' dial and integrated bracelet. It is powered by the automatic Caliber 3120 (40 jewels, 21,600 vph) with about a 60-hour power reserve,…
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