I recently purchased a Victorinox Airboss Mach 6 that is in brand new condition, keeps good time, but has the Valjoux chrono second hand "stutter" I've read about before. I'm going to have it serviced (the chrono hour hand is also not quite zeroed right), but I'm wondering how big a repair this is, and how much it can be improved.
I had a look at the second hand sweep with a high speed camera at work, and it's pretty obvious why it looks so jerky when you slow it down. While it does tick at the correct rate, the spacing is completely off, in random sequences like one large tick, two tiny ticks, etc. It occasionally misses a tick completely. It's kind of interesting watching it tick along with the actual second hand, which is perfectly smooth.