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The temperature you exist in isn't the same temperature as your watch sees. If you wrist actually got to -22C it would be frozen solid and it would turn black and die. It's doubtful if your watch ever gets below freezing on your wrist at all. Same for heat. Resting skin temperature is 31 C, and if it gets hotter than that your body tries to remove the heat by sweating or moving the blood around. If your body temperature exceeds 41 degrees C you die.
My Speedmaster Mark II survived 20 Minnesota winters (down to -40C) and twenty summers up to 40C, and I rarely took it off except at night. It finally succumbed to incompetent watch repair more than it did to the climate.
BTW, the thermal expansion coefficient for GLASS is WAY larger than quartz or sapphire. Same for titanium over steel. That's why the SR-71 Blackbird was made out of titanium instead of steel, and why my semaster is Ti also.
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