Roger Dubuis Bulletin D'Observatoire an 18ct white gold automatic wristwatch, no 13/28, circa 2010 dial: brushed silvered dial with polished Arabic numerals and black inner track for 24 hours indication, blued steel spade hands. Calibre: cal. 57, automatic movement, 25 jewels, adjusted to five positions. Movement number: 434. Case: an oversized 18ct white gold brushed and polished curved rectangular case with exhibition back secured by eight screws, stamped with the Geneva seal of quality. Case number: 13/28. Closure: Roger Dubuis leather band with 18ct white gold Roger Dubuis buckle. Dimensions: 34 x 47 mm. Signed: case, dial and movement. Accessories: none. Straps prior to shipping. Provenance: fine watches, wristwatches and writing instruments, Bonhams, Hong Kong, 29 November 2014, lot 1035, illustrated. Important jewels, Smith & Singer (trading as Sotheby's Australia), Sydney, 6 December 2017, lot 286, illustrated. Private collection, Queensland, acquired from the above