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What temperature extremes can my OMEGA watch handle?
OMEGA reports that the mechanical movements used in their watches use oils that allow the watch to operate at temperatures between -20 and +70 C (-2 to +158 F). Remember that the inside of the watch must reach that temperature. That is not terribly likely when you are wearing the watch on your arm--even while diving in very cold waters. If your body ever reaches -20C (-2F), then your watch is unlikely to be your topmost concern at that moment.
Your mechanical watch should continue to run at up to these temperatures. But near these extremes, the mechanical accuracy may vary more than normal. Yet a quartz watch is not always better for use in extreme temperatures--the electronic circuits used in a quartz movement will stop operating at cold temperatures that do not stop a mechanical watch movement.
Of greater concern are how sudden extreme changes in temperature can effect the water resistance seals of the watch.
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