I did reply on the other thread; note the starting time and put the watch in your pocket. From the clinics and ASA National Schools I have attended, you are urged to not actually time one minute or 20 seconds, particularly not to stand there looking at a watch.
NFHS does specifically state in the Umpire manual "Jewelry, except for wedding bands and Medical-Alert bracelets and necklaces, shall not be worn." No, it doesn't say watches specifically, but you wouldn't let a player wear a watch, and you would cite the jewelry rule.
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