The Keyless Works in a watch is what controls the manual winding, quick date changing and time setting functions of a watch. Back in the old days pocket watches had to be wound by a "key". The advancement of winding a watch by the stem and crown made the watch 'Keyless", hence the name.
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1st SEVEN WATCHMAKING TOOLS
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► Bergeon Screwdrivers https://watchrepairtutorials.com/get/... (Amazon)
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