DuRoWe 870 / Timex M84
Description
This movement was the second Laco/Timex electromechanical movement, which was used for example in Timex-Electric watches from 1965 on.
Its balance coil was switched by a thin contact, which used to wear out rather fast, and so, only four years later, its successor, Caliber 887 (M87) replaced it.
The second hand jumps in one-second steps, that means, that every sixth balance amplitude, it is driven a bit. Its direct relative, Caliber 880/881 (which uses the same main plate, as you can see on the photo) also features a date mechanism.
In Timex watches, this movement was named M84.
Technical data
| Manufacturer: | DuRoWe |
| Caliber: | 870 |
| Size: | 13 1/2''' |
| A/h: | 21600 |
| Number of jewels: | 7 |
| Escapement: | Electric |
| Shock protection(s): | Duro-Swing |
| Balance bearing / direction hairspring: | Bridge |
| Moveable stud: | yes |
| Adjust mechanism: | Long regulator arm |
| Features: |
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| Production period: | 1965 - 1968 |
| References: | Flume: K3 310 |
| Mentioning in literature (years): | 1969 |