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edscoble-
Guys at Alsal told me you really can't overwind. They suggested the concern you sometimes hear about overwinding is overstated. I don't know if it would be described as a safety feature per se but it is really obvious when it's fully wound.
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On manual wind watches you definitely can overwind. The end of the spring is usually fixed to the inside of the barrel and over winding can break it off.
On automatics, because the winding mechanism can be constantly winding the spring, the inside of the barrel wall usually has notches and the end of the spring drags along the wall and ratchets into them. So you’ll feel resistance when it’s fully wound but you can keep winding, even though it’s not the best thing for it.
chris0
Regal
Shout out to Alsal. They checked out my Smiths time factors watch as I was having issues with poor power reserve (turns out I was the clichéd watch owner not winding it enough) but as there was nothing to repair didn't charge. The wind does feel very different to my Hamilton with the same movement, though.