====== Duo dial ======
**Duo dial** generally refers to a "doctor's watch", with a large subdial for the seconds hand. It can also be used for any watch with two dials, including [[dual movement]] [[dual timezone]] watches.

===== Doctor's Watch =====
Doctors frequently use wrist watches as a timer when taking a patient's pulse. Although special-purpose [[pulsometer]] [[chronograph]]s might be better suited for the task, many doctors prefer using the seconds hand instead. Before the introduction of [[central seconds]], doctors found it difficult to precisely count seconds using a [[subdial]]. Therefore, companies like [[Hamilton]], [[Elgin]], and [[Rolex]] created so-called "duo-dial" watches with a seconds hand as large as the minutes hand. This subdial was usually placed below the regular hour and minutes dial in a rectangular case. This became known as a **doctor's watch** or **duo dial watch**.

===== Dual Dual Watch =====
In [[1960]], [[Nappey]] introduced the [[Nappey Jumelles Times|Jumelles Times]] watch with two movements side by side on the same dial for [[dual timezone]] use. Later models, including the [[Ardath]] [[Ardath Long Distance|Long Distance]] separated these dials, giving rise to the use of the **duo dial** term. This came to a head with [[Chopard]] who explicitly named their [[dual movement]] watch line [[Chopard Duo Dial|Duo Dial]]. Other companies used the term, **double dial** or **twin** for these watches.


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