I was recently considering the purchase of a Concord Impressario GMT which utilizes the Zenith 682 movement.
As I understand it there are two types of GMT "Quick Set" movements which can change time on an hour hand with the watch still running.
The first type is the Rolex design in which the quick-set jumps the 12hr hand in 1 hour increments. For travelers it seems more efficient to keep home time on the 24 hour hand and use the quick-set 12 hour for local time.
The second type has the quick-set jump the 24 hr. hand in 1 hour increments. This style seems to work well if one has to keep track of another time zone as to do business with an office in another time zone.
The Concord is of the second type and I am interested in the first type. Maybe someday a Rolex will be possible but in the meantime what other makers utilize the Rolex type quick-set that moves the 12 hour hand in 1 step increments, while allowing the watch to keep running?