Universal wristwatch and the relevant system for setting the time according to the time zone. The wristwatch (1) comprises concentric dials (A5 B5 -C) showing the 24 hours (dial B) 5 the 24 time zones (dial C) and the minutes (winder A) and comprises also selecting devices (11) suitable to implement a temporary- connection between the rotation of the time zone dial (C) and. the 24-hour dial (B) in order to realise an identical synchronous rotation further to which it will be possible to set the hour hand (O) on the new place thus obtaining independently and at the same time the collimation with the joint unit of dials (B) and (C). Once the aforesaid collimation is completed, the previous different rotation of dials (B) and (C) is restored. The result is to have the wristwatch (1) showing the time of the current time zone in twelfths and twenty- fourths, universal wristwatch, in addition to the other 23 places.
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