DuRoWe 870 / Timex M84

 
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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 880881 (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
Number of jewels:7
Shock protection(s): Duro-Swing
Balance bearing / direction hairspring:Bridge
Moveable stud:yes
Adjust mechanism:Long regulator arm
Features:SCD,EL
Functions:hour, minute, second, electromechanical
A/h:21600
Size:13 1/2'''
Production period:1965-1968
Literature: Flume: K3 310