WatchCharts on Instagram: "In 2019, Audemars Piguet discontinued the 15400ST, replacing it with the 15500ST. The most significant update being the in-house caliber 4302, a movement which was initially introduced in AP's
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SIHH 2019: Audemars Piguet Royal Oak ref. 15500. Live Pictures, Pricing and Detailed Explanation of Nuances. — WATCH COLLECTING LIFESTYLE