Abstract: A dual center wheel (38), provided with a plurality of dual center wheels (36) for display of times in different time zones, driven on a hands wheel for displaying the current time, and a dual adjustment member (49) adjusted by an external adjustment member (9), is formed from a gear (38a) and a pair of planetary wheels (44, 45) supported on the gear (38a). The dual center wheel (38) is also provided with a dual wheel (43), for which the rotation is regulated by means of a jumper spring, which engages one of the planetary wheels (44), and with a dual hour wheel (46) which engages the other planetary wheel (45) rotating on the same shaft as the dual wheel (43). The dual hour wheel ( 46 ), of which rotanional speed is reduced as a result of the rotation of the dual center wheel (38), makes one turn of an integer fraction of a rotation for a one pitch rotation of the dual wheel ( 43 ).