Just got out my slow running watch I got for a present a few years ago - from Next.
I reset the time earlier and it is spot on. If I wear it it will lose time.
There is nothing on the back like a recess to get a sharp knife or similar into - but it is a Next watch I suppose.
I changed the battery because it was losing time (original battery) but it wasn't that. It was designed not to last I suspect.
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