The Royal Oak Selfwinding ref. 15400ST.OO.1220ST.03 is the blue-dial stainless-steel 41 mm 15400 boutique configuration. WatchBase identifies it as Royal Oak 15400 Stainless Steel Boutique Edition, produced 2012–2019, with AP Calibre 3120, a 41 mm stainless-steel case and bracelet, 50 m water…
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