Using a Mechanical Watch on Shabbat
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Question
A mechanical watch (wound by moving the hand) that lasts for 18 hours, is it permissible to use it on Shabbat?
Answer
Hello,
It is permissible to use a mechanical watch that winds itself by the movement of the hand, as long as it is worn while the watch is operating.
Source
Shulchan Aruch, Orach Chaim, Siman 308, Sif 11
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