The Royal Oak Selfwinding ref. 15400ST.OO.1220ST.04 is the grey-dial stainless-steel 41 mm 15400 configuration added at SIHH 2017. WatchBase identifies it as Royal Oak 15400 Stainless Steel / Grey, produced 2017–2019, with AP Calibre 3120, a 41 mm stainless-steel case and bracelet, 50 m water…
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