quattro[Moderator]
18999
Minute Repeater GMT vs GMT Minute Repeater
Some Minute Repeaters display a second time zone, but can only chime the local time: let's call them Minute Repeater GMTs.
But other Minute Repeaters do not only display a second time zone: they can also chime the second time zone or the local time on demand: let's call the GMT Minute Repeaters.
Here's an example of each.
Best, Emmanuel
A/ Minute Repeater GMT
Parmigiani Fleurier Toric Minute Repeater GMT, ref. PF000463 (2003)
42 mm
platinum case & manual
cal. 250 (33 jewels) with radial
date (set via the
pusher at 2 o'clock),
second time zone at 3 o'clock (set via the
pusher at 5 o'clock) and
small seconds at 9 o'clock

credit: @watchesbylogan (1-3), Phillips (4-7) & Episteme Vintage (8-9)
B/ GMT Minute Repeater
Panerai Radiomir 1940 Decimal Repeater Carillon Tourbillon GMT, ref. PAM00600 (2016)
49 mm polished Goldtechβ’ case powered by caliber P.2005/MR (28,800 vph, 59 jewels, twin barrels with 4 days of power reserve) featuring:
- a decimal carillon repeater complication (three gongs with three hammers)
- a second time zone (home time) at 9 o'clock
- a day/night indicator of the second time zone at 3 o'clock
- a power reserve on the back
This watch can chime both home & local time on demand: one can switch between the two with the pusher set into the crown (making the watch look a bit like a monopusher chronograph). The red dot indicator under the second time zone sub-dial at 9 o'clock shows whether home time (HT) or local time (LT) is selected for chiming. The activation button of the repeater is placed at 8 o'clock.
As this watch shows only whole hour offsets from the second time zone, the two chiming sequences are identical except for the hours: so, there was no need to duplicate sets of hour, 10-minute, and minute cams: "only" two sets of hour striking mechanisms were needed.

credit: Hodinkee & Panerai