The Toric Hémisphères Rétrograde is the ul­ti­mate trav­eller's time­piece. With its two time zones, it al­lows any two lo­ca­tions to be paired, and cor­rect to the near­est minute. It even al­lows those lo­ca­tions with a half-hour or quar­ter-hour dif­fer­ence to be paired with full hour times set from the Green­wich merid­ian. A mod­ule is in­dexed to the main move­ment in or­der to gov­ern the sec­ond time zone. By pulling out the small crown at 2 o'clock, the mod­ule is dis­en­gaged from the move­ment, mean­ing that it can be ad­justed in­de­pen­dently of the sec­ond time zone, to the near­est minute. When the crown is pressed back in, the move­ment and the mod­ule re-en­gage and the sec­ond time zone is re-in­dexed to the first so that they op­er­ate si­mul­ta­ne­ously with the de­sired in­ter­val. The main crown at 4 o'clock is used to wind the move­ment and set the time of the two paired time zones, such as the date. Each of the time zones is as­so­ci­ated with a win­dow, which pro­vides the day/night in­di­ca­tion so that the time of day can be read in an in­stant for each time zone. The cal­i­bre PF 317 also fea­tures an in­stant ret­ro­grade cal­en­dar, in­di­cated by the third cen­tral hand. As it moves to­wards the last days of the month, the hand ac­ti­vates a spring which drives it back to num­ber 1 with great force. This 240° move­ment is so fast that it can­not be seen with the naked eye. This self-wind­ing move­ment has a dou­ble se­ries-mounted bar­rel for im­proved isochro­nism and rate reg­u­lar­ity, with a power re­serve of 50 hours.

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