in a Senator Perpetual Navigator. There is no power reserve indicator so I have no idea of how fully wound it may be (or not be). However, it does not stop or falter during use and it maintains time accuracy so it clearly has sufficient power to operate as it should (whether or not it achieves fully wound status).
Hope that helps (Art, who has several Cal. 39's, may weigh in on his experience).
JackB
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