Audemars Piguet, Octagon, a work from the 1970s, a contemporary design by Zunda, and the Royal Oak 5402 belong to the same era, but they are positioned as ultra-thin dress gold watches, Ref.5418BA, with only a few dozen pieces produced. • Case: 18K gold, octagonal cushion-shaped outline, approximately 35X33mm in size • Movement: Cal.2121 ultra-thin automatic movement • Dial: Champagne gold brushed original dial, date window at 3 o 'clock, stick-shaped hands