Audemars Piguet Selfwinding Blue Sapphire "50th Anniversary"

Audemars Piguet's Royal Oak Selfwinding "50th Anniversary" ref. 15514BC.SS.1284BC.01 is a 41 mm case in 18-carat white gold. The dial is blue and sits under a sapphire crystal. Inside is the self-winding calibre 4309, showing hours, minutes and centre seconds. This example belongs to a set of ten pieces, each set with a different gemstone, and here 861 baguette-cut blue sapphires cover the bracelet and case for a total of roughly 41.4 carats. The bracelet is white gold with an AP folding clasp. Water resistance is rated to 50 metres.