Timepiece movement comprising: - a frame, - a first toothing arrangement and a second toothing arrangement which are fixed with respect to the frame during normal operation of the timepiece movement, - a first transparent disc mounted to pivot with respect to the frame about an axis perpendicular to the plane of the frame, the first transparent disc bearing a barrel, a first train (15, 16) and a regulating organ (17, 18, 19), the barrel meshing with the first toothing arrangement so that the letting down of the barrel drives the first transparent disc in rotation about said axis, the first train (15, 16) meshing with the second toothing arrangement so that the rotation of the first transparent disc drives the first train (15, 16) in rotation with respect to the first transparent disc in order to drive the regulating organ (17, 18, 19), - a member for displaying a first time value fixedly attached to the first transparent disc, and - a member for displaying a second time value kinematically connected to the first transparent disc, characterised in that - the frame has a through opening along said axis, in which opening the first transparent disc is located, - the member for displaying the second time value is fixedly attached to a second transparent disc mounted to pivot about said axis in the through opening, - the first transparent disc and the second transparent disc are each provided with a peripheral toothing arrangement (4a, 7a), and - the peripheral toothing arrangements (4a, 7 a) of the first transparent disc and of the second transparent disc are connected to one another by a second train located in the frame, outside the through opening. - a frame, - a first toothing arrangement and a second toothing arrangement which are fixed with respect to the frame during normal operation of the timepiece movement, - a first transparent disc mounted to pivot with respect to the frame about an axis perpendicular to the plane of the frame, the first transparent disc bearing a barrel, a first train (15, 16) and a regulating organ (17, 18, 19), the barrel meshing with the first toothing arrangement so that the letting down of the barrel drives the first transparent disc in rotation about said axis, the first train (15, 16) meshing with the second toothing arrangement so that the rotation of the first transparent disc drives the first train (15, 16) in rotation with respect to the first transparent disc in order to drive the regulating organ (17, 18, 19), - a member for displaying a first time value fixedly attached to the first transparent disc, and - a member for displaying a second time value kinematically connected to the first transparent disc, - the frame has a through opening along said axis, in which opening the first transparent disc is located, - the member for displaying the second time value is fixedly attached to a second transparent disc mounted to pivot about said axis in the through opening, - the first transparent disc and the second transparent disc are each provided with a peripheral toothing arrangement (4a, 7a), and - the peripheral toothing arrangements (4a, 7 a) of the first transparent disc and of the second transparent disc are connected to one another by a second train located in the frame, outside the through opening.