To remove a movement from the case, the crown with the winding stem often has to be removed after opening the case. In most cases this is quite simple, but there are also a few more complicated ways.
Removing Crown and Winding Stem
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.
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.
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.
The Förster 220 automatic movements
The automatic movements of the 220 caliber family from the German manufacturer Bernhard Förster were very successful in the 1970s. Here we take a look at a few particular features of these movements.
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.
