Vacheron Constantin's sports watch collection gets its first tourbillon, courtesy of Calibre 2160 whose extra-thin profile measures 5.65mm high (and barely more than 10mm high for the case). Such slender forms, due in no small part to the peripheral rotor, by no means detract from the autonomy of a watch that delivers a comfortable 80 hours of power reserve. The distinguishing features of the Overseas collection are perfectly respected, with the characteristic six-sided bezel and a blue dial whose colour is brought out by the steel case. Beating at 2.5 Hz, the Overseas Tourbillon shows hours and minutes, while small seconds are on the tourbillon carriage which is openworked in the shape of a Maltese Cross, the emblem of the Manufacture. It comes with three interchangeable straps.