27. 27Y Cartier. A fine lady's 18K gold manual wind diamond set wristwatch Model: Tortue Date: Purchased 29 August 1984 Movement: 17-jewel Frédéric Piguet Cal.21 manual wind, adjusted to 6 positions, No.14648 Dial: Silvered, black Roman numeral hour markers, black outer minute track with 5 minute markers, secret signature at 10, blued steel sword hands Case: Brushed and polished tonneau form, back secured by 4 screws in the band, diamond set crown, bezel and lugs, No.960700114 Strap/Bracelet: Black Cartier lizard leather Buckle/Clasp: Signed 18K gold buckle Signed: Case, dial & movement Size: 22mm Weight: 28,59gr Accompaniments: Cartier box, original purchase invoice dated 29/08/1984 The Cartier Tortue was introduced in 1912 as one of the brand's first non-circular shaped watches. Its tonneau-shaped case stands out for its subtle balance between curves and straight lines. It also incorporates codes and references specific to the brand's watch designs, such as Roman numeral hour markers, outer or inner minute track, and blued steel sword hands. It is often equipped with high-precision mechanical movements, for some of them developed in collaboration with renowned Swiss manufactures. The present Lot features a Frédéric Piguet calibre, a manufacturer that has been supplying the watchmaking industry since 1858.