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Dual-time watches
References in the Grail Atlas catalog carrying the dual-time complication.
A dual-time watch shows a second timezone separately from the main display, typically through a sub-dial at 6 or 9, sometimes through a second small hour hand on the main dial. It is the simpler cousin of the GMT: no 24-hour bezel, no fourth hand, just home time visible alongside local time. The complication is favored on dressier watches where a bezel would break the formality.
What to look for
The Jaeger-LeCoultre Reverso Tribute Duoface is the category's standout, two faces on the swivel case, the back showing the second timezone. Patek Philippe's Calatrava Travel Time 5524 and 5990 (the latter combining travel-time with a flyback chronograph) are the dress-and-sport executions. A. Lange & Söhne's Lange 1 Time Zone uses a city disc and a small second hour-hand. Decide between true-travel-time (independent local hour, retained home time. Patek 5524, JLC Master Geographic) and office-dual-time (24-hour sub-dial showing GMT only). The former is what the complication is supposed to do.
