N7 1977 Accutron Quartz - TZ (Time Zone) model. Rare variant, you can set the hour hand independently. No serial number on case or on movement. Accuset button at 4 o'clock position.
Mike
An Accutron Quartz for which we may have a mode name "Time Zone". I wonder if Time Zone is an advertised model name or a series of these 242 models? Sounds like a feature, but I'm not sure what feature "time zone" would be?
EDIT: Does time zone refer to a feature/function which allows the user to move back (or forward) only the hour hand in one hour increments?
I've included some info from the 242 Service Manual. It states the Time Zone was a feature, seen only in the 2426.10 model (no Day window). This model number can be identified under the battery - current photos do not provide us that.
Another nice Accutron Quartz (possible Calendar, if we wanted to distinguish from other Accutron Qtz)
In reply to I've included some info from by Andersok