The Junghans J89 has a single and very large mainspring barrel. Therefore a wheel is necessary, that stops the ringing-movment and which prevents complete running down of the mainspring and keeps the watch movement running. The owner of the watch should raise the spring after sounding the alarm, because with the running of the alarm there is loss of the power reserve.
The design of the constructor Albert Letsche reminds of a chronograph due to the three crowns.
Alarm duration: 10 sec
J89-2: 17 stones for the American market
J89-3: high hand movement for strongly convex dial
In the early models, the outer scale shows a 10-minute division, but in later models this design feature is missing. In addition, you often find the imprint "Minivox" on the dial of the earlier models, later on, there are only 20 jewels on the dial.
And this, although later versions of the movement were usually equipped with an additional ruby (actually 21 jewels) for the bearing of the fourth wheel by the friction spring.
Another difference between younger and older movements can be seen in the surface structure of the movements, the early movements are grained and gilded, the later ones are only finely polished and rhodium-plated.
Hier noch weitere Versionen des Junghans J89; Junghans 689.70.
Wer Informationen zu einem weiteren Armbandwecker von Junghans sucht, der ist hier richtig: Junghans top timer; AS 5008