Junghans 667.01

Description

Even though the Junghans 667 (here in its base version Junghans 667.01 without date indication) was not the very first quartz caliber for wristwatches from Junghans (its predecessor, the caliber 666 was made in low quantities only), it was the first one to bypass the one million mark, regarding its production quantity.

The complete series 667 was made between 1975 and 1981, the caliber Junghans 667.01 between 1975 and 1978.

It already shows visible signs of a very efficient production, but is still high-quality made, with in total nine bearing jewels.

The center minute wheel is located directly on the base plate, all other gears are housed in a kind of plastic assemply capsule, which is put between the pillars of the movement skeleton.

You can see the conventional gear train with its large gears, consisting of the rotor, reduction wheel, seconds wheel, third wheel and indirectly driven center seconds wheel. The third wheel engages with the minute wheel.

A small spring acts a brake for the center seconds pinion and avoids fluttering of the center seconds hand.

The free space will be occupied by the large coil, which is very sensitive, unfortunately, on both specimen in the archive, it is defective.

The electronics module is quite simple. On its lower side, there’s the 32kHz quartz and an IC of type NEC 8106YA, on its upper side a capacitor and the trimmer capacitor, which tunes the quartz frequency to exactly 32768Hz.

There’s not much to say about the dial side. We have a kind of yoke keyless works, but the hands setting occurs on the base plate by just pulling the stem, whose end engages then with the hand setting wheel.

This movement shows, that already in 1975, the development of the quartz wrist watch was quite finished. Since then, hardly anything changed construction-wise, only the execution is much, much cheaper.

Technical data

Usage gallery