Patent ID: 8264911

Claim:
A universal wristwatch ( 1 ), comprising: an outer fixed winder (A) graduated in both twelve (12) hours and 60 minutes that shows hours and minutes; a smaller 24-hour graduated dial (B) with internal and concentric numbering increasing clockwise and making one complete turn clockwise in 24 hours; an inner time zone dial (C) completing clockwise two turns a day, concentric and internal to the winder (A) and the 24-hour graduated dial (B); a planisphere represented on a surface of the time zone dial (C) with the South Pole in the middle; twenty-four (24) equidistant peripheral hands subdividing the planisphere and showing a time of each of twenty-four (24) corresponding time zones in which the planisphere is subdivided; an hour hand (O) mounted on an hour shaft ( 10 ), the hour hand completing two turns clockwise in 24 hours; a minute hand (M), completing one turn clockwise each hour, the minute hand showing the minutes, identical for all time zones; a gear kinematic chain (r 1 , r 2 , r 3 , r 4 ), wherein the hour hand (O) rotates by the hour shaft ( 10 ), and the hour shaft ( 10 ) transmits by the gear kinematic chain (r 1 , r 2 , r 3 , r 4 ) motion to 24-hour graduated dial (B), one gear (r 4 ) of the gear kinematic chain being integral with said 24-hour graduated dial (B) with a gear ratio of 2:1, so that to each turn of the hour shaft ( 10 ) corresponds a half turn of the 24-hour graduated dial (B); a coupling ( 12 ), wherein the time zone dial (C) is coupled to the hour shaft ( 10 ) by the coupling ( 12 ); and a coaxial and external selector ( 11 ), wherein the coupling ( 12 ) is turned by the selector ( 11 ) through a sliding pin ( 13 ) which extends from the coupling ( 12 ) and engages in a groove ( 14 ) of the selector ( 11 ), said selector ( 11 ) being connectable to another gear (r 1 ) of the gear kinematic chain, wherein each turn of the hour shaft ( 10 ) corresponds to a turn of the time zone dial (C), confirming the ratio 2:1 between the 24-hour graduated dial (B) and the time zone dial (C), said selector ( 11 ) being detachable from said coupling with the another gear (r 1 ) and settable to the one gear (r 4 ) in order to implement a connection between the rotation of the time zone dial (C) and the 24-hour graduated dial (B).