The steam-age power-reserve indicator along the bottom underlines the linear configuration of the movement. The flying tourbillon animates the endless locomotion through time in precise jumps of six degrees of arc. Its diamond endstone (Harry Winston oblige) proclaims a D-flawless finish throughout: the rails for the sliding weights are so smooth that oil would create friction.

This mechanical installation can be viewed from unusual angles — through lateral windows in the upper and lower caseband.

Also unconventional is the manual winding and time-setting system — direct drive through the back of the watch to the barrel arbor and under-dial work respectively.

Following this year’s sixth Opus watch and a Westminster-chime repeater, the “locomotive” sets Harry Winston’s new watchmaking on an artistic railroad of colour, that combines motion and form.