Someone rolled the dice and got lucky, as this discontinued 41mm Royal Oak ref. 15400ST was originally retailed in Las Vegas in December 2016.

Featuring the silver grande tapisserie dial, and in super crisp condition, the brushed steel octagonal case is perfectly proportioned with its integrated (individually faceted) bracelet, offering maximum comfort on the wrist. Visible the through the exhibition (sapphire) case-back is AP's self-winding calibre 3120 movement, waterproof to 50m. 

Presented with its Audemars Piguet box & warranty booklet dated December 2016.