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Horological Meandering

It's actually not that small, it just looks small...

 

The watch is 40mm in diameter. The movement is 30mm in diameter which is unusually wide for a movement and it fills up the case nicely with only 5mm of case material on all sides. Most watches with a 40mm diameter have a smaller than 30mm movement.
The balance spring appears to be nearly 10mm in diameter, which is a decent size, but looks small relative to the movement. For a 3HZ 21.6K beat, that's actually a decently sized balance wheel.

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