Now about leaving your chronograph running all the time...personally for most watches where parts are available, I really would not have any problems letting the chronograph run. So on an Omega 861/1861, or a 7750 based watch, the parts that would need replacing from excess wear are readily available and not expensive. So if you want to let it run all the time, then in my personal view, go ahead. For a watch where parts are less easy to find, such as a Cal. 321, I would not recommend it. Again you want to preserve the parts in that movement as much as possible.
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