I have recently fixed my first 400 day clock. I think it is an older Haller - it is all metal, no plastic to be seen. It says "Haller" on the dial but the movement just says "Made in Germany". Anyway, having observed the clock for a couple of weeks now, I have noticed that the pendulum rotates further when the minute hand is between 9 and 1 than it does at other times. Apologies if this has been covered before but I searched the forums and couldn't find anything. If I had thought about it, I might have expected greater rotation when the minute hand was descending and a lesser rotation when the clock was working to lift the minute hand. However a peak between quarter to and five past the hour has me scratching my head. Anyone noticed this with their clocks or have an explanation? Something to do with resonance in the spring varying as the minute hand rotates? The only (unsorted) untoward thing I noticed with this clock is that the escape wheel teeth are quite worn. I have attached two videos showing the rotation at different times.
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