I thought the difference was that self winding watches kept going even though the mainspring was fully wound, potentially damaging the watch and also making it run fast whereas automatic watches have a 'slipping mainspring' which stops this.
Could be completely wrong though.
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I thought the difference was that self winding watches kept going even though the mainspring was fully wound, potentially damaging the watch and also making it run fast whereas automatic watches have a 'slipping mainspring' which stops this.
Could be completely wrong though.