Watch Paparazzi

Entrepreneur Santiago Castro spotted wearing Audemars Piguet

Los Angeles entrepreneur Santiago Castro was recently seen wearing the Audemars Piguet Royal Oak Selfwinding 41mm in stainless steel, reference 15500ST.OO.1220ST.03 — the black dial variant featuring the brand's signature 'Grande Tapisserie' pattern. The sighting places this highly collectible sports-luxury watch firmly in the entrepreneurial and tech-forward cultural orbit that has driven Royal Oak demand over the past decade.

Introduced in 2022 as the direct successor to the long-running 15400ST, the Royal Oak 15500ST brought meaningful horological upgrades. At its heart beats Calibre 4302, an in-house automatic movement offering a 60-hour power reserve — up from 60 hours on the prior generation but with substantially improved côtes de Genève finishing and a more architecturally coherent rotor design. The movement is visible through the sapphire display caseback, one of the defining features collectors note when distinguishing the 15500ST from earlier references. The 41mm stainless steel case retains the iconic octagonal bezel secured by eight hexagonal screws, a design language Gérald Genta penned for AP in 1972 that remains one of the most recognisable silhouettes in watchmaking.

The black index dial on reference 15500ST.OO.1220ST.03 is widely regarded as the most versatile and collector-correct configuration in the 15500ST lineup. The 'Grande Tapisserie' guilloché texture — hand-applied across the entire dial surface — interacts differently with light depending on viewing angle, giving the watch a visual depth that photographs rarely capture accurately. Applied white gold hour markers and the characteristic integrated bracelet in polished and brushed stainless steel complete a package that has become a benchmark for integrated-bracelet sports watches.

Santiago Castro, known in Los Angeles business circles as a prominent figure in e-commerce and digital retail ventures, brings the 15500ST into a demographic that values understated prestige over overt luxury signalling — precisely the cultural positioning Audemars Piguet has cultivated for the Royal Oak since its inception as a deliberately provocative high-end sports watch.

On the secondary market, the Royal Oak 15500ST in stainless steel with a black dial trades at a significant premium above its official retail price, reflecting persistent demand and constrained authorised dealer allocation. Retail is set at approximately $29,500 USD, while grey-market valuations for this specific reference have settled near $100,000 USD — a multiple that underscores the Royal Oak 15500ST's status as both a wearable watch and a store of value.