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I have lost the 3V adapter for my watch winder.
Can I use any old 3V adapter or will I die?
Almost. Need to check that it's DC, there are a few AC units out there, that it's got enough power (should be fine, I doubt you'll find one too small) and finally that the connector polarity is correct
Erŕrrrrrr
What?
3v, correct size, and vitally important, check the polarity
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"Erŕrrrrrr
What?"
There are two types of electricity, Direct Current (DC) and Alternating Current (AC). You need the correct one.
Do you still have the old adaptor? Can you post a picture of the writing on it? We will be able to advise on its spec and what will be a suitable replacement better.