Buttonhole watch: extremely rare buttonhole watch in 18K gold with diamond and ruby setting, punched 'bté s.g.d.g H.R' No. 25172, probably Tiffany ca. 1900 Ca. Ø23mm, bezel ca. Ø11.5mm, ca. 13.5g, 18K pink gold, bezel alternately set with diamonds and rubies, cylinder escapement, white enamel dial with blue numerals and red 12 in perfect condition, in working order, cleaning recommended. The gold version of buttonhole watches, additionally set with gems, is extremely rare. An identical watch, also stamped 'bté s.g.d.g H.R' No.23018, was sold at Koller Auctions in 2007. This watch was still in its original box, signed Tiffany & Co, estimated price 8,000/ 12,000 Swiss Francs (source: https://www.cortrie.de/go/XKE).

Composed of several subsidiaries, the Drouot Group is a major player in the art market. Hôtel Drouot, located in the heart of Paris, has been the world's largest public auction center since 1852. 15 salerooms are available to more than 70 auction houses. The emulation generated by an annual offer of 230,000 artworks from 21 major specialities - from Antiquity to street art - attracts some 3,000 visitors every day. The Group's digital platform, Drouot.com, offers digital sales - Live auctions (live broadcasting and participation in auctions), Online-only auctions (dematerialised auctions) and Buy Now sales (sales of lots at fixed prices). Nearly 2 million items are offered annually by 600 auction houses. Auction news is reported every week in La Gazette Drouot, the leading weekly magazine for the art market and culture published by Auctionspress.