Gold, diamond, onyx and enamel 'Comet' 8-days clock, Cartier. Photo Sotheby's

The round clock with a revolving pale salmon-colored enamel dial over a guilloché-ground, with a starburst set white enamel rim featuring black enamel Roman numerals encircled by numerous small rose-cut diamonds, movement signed E.W.C & Co., Inc. for European Watch & Clock Co., Inc., movement numbered 152531, case numbered 531, reference number 365; circa 1920. Estimation 40,000 — 60,000 USD

For a clock a similar design see The Art of Cartier, Gilles Chezal, page 69, plate 39, catalogue number 212.