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Identify this calibre ?


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It helps to have an approx measurement to start with, 26mm is the most likely unless it's a really big watch. There is a list here to confirm https://www.cousinsuk.com/product/chinese-movement-list and a catalogue here https://www.cousinsuk.com/document/product/chinese-movement-list, but I don't see auto, 3 hands, no date as an option

 

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    • Great diagram with the teeth and pinion count. Simple way to reduce the speed of the hour wheel by the 12:1 minute wheel. Genius and yet so simple. Always good to reinforce the principal by what you have done in your drawing. Keep doing that. I had a drawing on my wall for years showing me this which is very similar to the drawing you have done. Here's a formula to work out the beats per hour of a watch movement. The movement's BPH is dictated by the wheel teeth and pinion count and the hairspring being vibrated to the correct BPH by finding the pinning up point on the hairspring using a vibrating tool.  The reason in the formula there is X2 on the top line is because there are two pallet stones.
    • So I just wanted to say "thank you" again.  The angle is the key bit it seems and yes, it did basically just fall, or float, back into position when I got it lined up just right.
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