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I acquired an old ETA 2824 movement that was out of a Technos watch. While taking it apart for a thorough service I learned quite a bit about the movement. The keyless works, date change parts, sliding and winding pinions were different to the current ETA 2814-2. The stem was of the helicoidal type - but was missing. I was very lucky to source some. I also changed to rotor for a new Swiss one. I had great fun in stripping it down and, as this was my first ETA 2824 service, was amazed at the quality of the components. When I opened the barrel, the spring was almost mint condition, in fact, I think the movement had hardly been used. Now, after its service and bringing it back to life, I think it's a fantastic movement. Here are a couple photos and a video of the timegrapher readings. I think I could even improve the -/+ sec/day setting. Timegrapher readings for dial side up and crown down. There's not much fluctuation in other positions.