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.
