The most recent addition to my collection: A 1958/59 "Ruhla" watch. Definitely not one of the better known manufacturers (the vast majority of search results are of the "what the hell is this watch" variety), Ruhla was East Germany's primary state-owned ("Volkseigener Betrieb") watch manufacturer from the early 1950s through the dissolution of the DDR. The watches were produced in massive quantities for use domestically, throughout the iron curtain, and also exported to many western countries.
The vast majority of Ruhlas used the Calibre 24 movement. This was an in-house movement utilizing an entirely mechanized, highly efficient manufacturing process. The downside of this being that the Cal. 24 is a very low-grade pin pallet movement without shock protection. Not much to look at, either:
Fortunately, the early models utilized a variety of higher-grade, more conventionally manufactured movements. This particular watch has the UMF M 2c movement. A simple manual-winding 16-jewel movement with shock protection. Ruhla movements generally have a reputation of being reliable and relatively accurate (even the cal. 24 pin pallets, surprisingly).
Overall it's just a simple, attractive dress watch in excellent condition. It keeps time to within about 8-10 seconds a day. According to my geiger counter, the dial has radium paint on the hands and markers, but it's fortunately far less radioactive than my grandfather's Tudor of the same period. The dial is marked "UMF Ruhla", or "Uhren Maschinenfabrik Ruhla" (Ruhla Watchworks.) Later models drop the UMF and simply say "Ruhla."
It's interesting to note that the dial markings on the early models say simply "Made in Germany", while later models say "Made in GDR." The Berlin Wall was not yet built in 1959, and hopes of a near-term German reunification had not yet been thoroughly dashed, so I'm guessing the DDR did not feel the need to specifically indicate East German origin at this time.
Ruhla watches seem to have essentially zero value to any collectors. The upside to this is that they're dirt-cheap, and there are tons of them available (Although all examples after 1963 will use the Cal. 24, or one of their later electric or quartz movements).