The Zeitwerk Minute Repeater, on the other hand, is going to be a regular production piece, and while the Grand Comp is an extremely traditionally constructed watch (albeit one with a lot of small tweaks to its traditional watchmaking solutions, intended to make it generally more reliable, durable, and robust) the Zeitwerk is pretty ground-breaking.
The Zeitwerk Minute Repeater is a so-called decimal repeater: that is to say, it chimes the hours on a single gong, and then each ten minute interval after the hour on two gongs –ordinary minute repeaters chime the quarter hours –and then the minutes. Decimal repeaters are quite rare; I’m aware of only two others. One is Kari Voutilainen’s decimal repeater, which was introduced in 2005, and the other is the Seiko Credor Spring Drive Minute Repeater. You will sometimes see the term “decimal repeater” in reference to repeaters made just after the French Revolution –these are repeaters that keep time according to the Republican decimal time-keeping system, which had 10 hours per day, 100 minutes per hour, and 100 seconds per minute –but these are different from the modern decimal repeaters, of course.
The Zeitwerk Minute Repeater’s construction is very different from that of most other repeaters. In general minute repeaters “sample” the time from the motion works of a watch –that is, the gears that determine the position of the hands. The Zeitwerk, on the other hand, has no hands –instead, it uses a system of rotating disks. The Zeitwerk Minute Repeater, therefore, has to have its repeating works constructed so as to allow the snails and racks for the repeating system to sample the time from the positions of the disks.
source: revo-online.com by JACK FORSTER