Cal. 237 is a flyback chronograph movement with date produced by Valjoux between 1971 and 1974. It is extremely rare, with just 300 said to be produced in that time. It is part of the Valjoux 72 family of movements and can be thought of as an enhanced version of Valjoux Cal. 23 “VZ”. It is closely related to Valjoux Cal. 235.
Valjoux 237 Functions
There is conflicting information about the functions of Cal. 237. It would appear to be similar to Cal. 234 and 235, with a 30 minute counter at 3:00 and small seconds at 9:00 plus a date window at 6:00. Wakmann, at least, produced a watch with this configuration.
However Le Phare and Lorenz, at least, produced regatta timers with Cal. 237 that have a regatta timer window at 3:00 and date at 9:00 with no running seconds.
Valjoux 23/72 Family Movements
The Valjoux Cal. 23/72 family was primarily made up of eight movements, with all others being variations on these. Many components are shared between most or all of these movements, with the main variations happening together over the long production of the series.
- Cal. 23 VZ – Basic movement with no hour counter
- Cal. 72 VZH – Basic movement with hour counter
- Cal. 72c VZHC – Cal. 72 with triple calendar
- Cal. 88 VZHCL – Cal. 72c with moon phase
- Cal. 78 VZSC – Non-chronograph triple calendar
- Cal. 90 VZSCL – Cal. 78 with moon phase
- Cal. 69 DX – Compact 10.5 ligne chronograph
- Cal. 89 DXC – Compact 10.5 ligne triple calendar
| Complications | 18,000 A/h No Chrono | 18,000 A/h No Hours | 18,000 A/h Hour Counter | 21,600 A/h No Hours | 21,600 A/h Hour Counter |
|---|---|---|---|---|---|
| Base | 23 VZ 69 DX | 72 VZH 722 | 236 | 726 727 | |
| Flyback | 230 | 720 | 235 | 725 | |
| Date | 232 | 234 | |||
| Triple Date | 78 VZSC | 23C | 72c VZHC 723 | 730 | |
| Flyback and Date | 237 | ||||
| 24 Hour Hand | 724 | 729 | |||
| Calendar and Moon Phase | 89 DXC 90 VZSCL | 88 VZHCL | 886 | ||
| Tide Calculator | 721 |