This vintage Cartier Santos Octagon ref. 187902 is an iconic two-tone timepiece from the late 1980s/early 1990s, combining stainless steel with an 18k yellow-gold octagonal bezel. The case measures approximately 30x38 mm in diameter and features the characteristic exposed gold screws, a blue sapphire cabochon crown and a sapphire crystal. The elegant cream/ivory dial is signed Cartier and features black Roman numerals, a railway minute track, blued-steel sword-shaped hands and a central seconds hand, with a date aperture at 3 o’clock. The watch is powered by a Swiss quartz movement, calibre 687, providing hours, minutes, central seconds and date functions. Completed by its integrated two-tone steel and 18k yellow-gold bracelet, the Santos Octagon remains one of Cartier’s most distinctive vintage designs.