I think that the Calibre 12 does have overwinding protection. So, what you feel I believe is normal.

: Hi all,

: Since I got my 11630, I'm still in love with this watch. But did
: have a quick questions - there have been occasions when I've let
: it wind all the down. And I usually give it a few turns manually
: to get it started up again. That said, it feels a little
: "gritty" and eventually gives enough resistance that I
: stop. Is that normal for a cal 12? On my other automatic
: watches, I never worry about overwinding but wanted to see if
: this is particular to the Cal 12. Appreciate your feedback!

: Regards,
: Alex