The escapement stem had been repaired badly. I guess a watchmaker who repaired it couldn’t make a right stem, and just replaced it with a wrong part.

The both upper and lower stems are not right size and shape. It needs to made and replaced.

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Turning off for escapement.

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Turning off for upper stem.
It was polished and Burnished.

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The lower stem was turned off as the same as upper one.

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Completed!