Abstract: The invention concerns a timepiece with mainspring of the so-called fly tourbillon type, the tourbillon having a balance bridge (2) forming a cage with a collet (1) and a single protruding ball bearing (5) supporting said so-called fly tourbillon assembly. Said so-called fly tourbillon assembly is visible on the dial side (15) and is designed as an independent tourbillon module. Said tourbillon module is separable from the clockwork (13) by being detached on the rear side of the clockwork (13) and by being removed on that same side.

Abstract: A mechanism for setting and winding of a clockwork, with a winding button spindle, rotatable around its arbor and displaceable in the axial direction, and with a first gear arranged at a distance from the winding button spindle, rotatable around its arbor and displaceable in the direction of its arbor. The rotational movement of this first gear is operatively connected to the rotational movement of the winding button spindle via at least one additional gear. The axial displaceability of the first gear is operatively connected to the axial displaceability of the winding spindle via a first connection device, so that the first gear can be engaged in the axial direction with additional clockwork parts by axial displacement of the winding spindle.