Seiko NH34 and NH36

The NH34 and NH36 share a family with the NH35, but they are not interchangeable labels for an all-purpose complicated watch. Each adds a particular display.

NH34: a second time indication

TMI identifies the NH34 as a three-hand, GMT-and-date movement. The additional hand completes one revolution in 24 hours and needs a matching scale. Its setting instructions provide independent adjustment of the 24-hour hand: the arrangement often called a caller GMT. TMI NH34 technical and operating information.

That is different from a travel watch whose local 12-hour hand jumps independently. Both arrangements can be useful; they solve different setting tasks.

NH36: calendar information

The NH36 adds a weekday display beside the date in the modeled execution. TMI lists both calibres at 3 Hz with 24 jewels. Extra display hardware also means paying attention to dial openings and the supplied calendar printing. TMI NH-series line-up.

Do not assume a set of hands fits merely because two movements have similar main dimensions. A GMT hand introduces another level in the central hand stack.

In the atelier

Adding a GMT hand selects the NH34 and a 24-hour bezel. The virtual GMT hand currently shows your local time on that 24-hour scale; there is no independently settable reference-time control. It is a display study, not a working travel-time utility.

Choosing Day-date can select the NH36, with both calendar windows at three. This catalogue does not combine NH34 GMT with an NH36 weekday mechanism. See GMT displays and date displays for the visual trade-offs.