The UMF 24-39 for Ruhla Sumatic and midimatic alarm clocks

The caliber UMF 24 from the VEB Uhrenkombinat Ruhla (UMF = Uhren- und Maschinenfabrik = watch and machinery factory) is probably the best-known mechanical movement built in the former GDR. Around 130 million of these simple and inexpensive pin lever movements are said to have been built between 1963 and 1990, many of them for export.

Ruhla Sumatic with UMF 24-39
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Wintermantel: Miniature Clocks from the Black Forest

Wall clocks are not normally my thing. But the ones shown here are so small and cute that it’s worth taking a closer look at them. These are miniature clocks from the manufacturer Wintermantel in Triberg in the Black Forest, Germany.

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Malleray Watch – Watch Movements and History

Malleray Watch Co. is a largely unknown manufacturer of watch movements. Reason enough to compile what is known about the history and movements of this company.

Malleray Watch movement and Malleray coat of arms [Source coat of arms: Wikipedia]
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Pocket Watches with Stop-Seconds

In modern wristwatch movements, such as the ETA 2824-2, the stop-seconds function, also called hacking seconds, is largely standard. This means that when setting the hands, the second hand is stopped in order to set the watch as accurately as possible to the second. Here I present two pocket watches from the period between 1930 and 1940 that also have this complication.

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Watches with regulator dial

Regulator dials stand out at first glance. Where there are usually at least two hands turning in the center of the dial, namely those for the hours and minutes, there is only one hand, the one for the minutes. The hour hand, like the second hand, is a small hand above or below the center. What is this good for and where does it come from?

Nienaber Regulator 2
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