I was surprised as I had to send a Tissot back once and that was a 2 month wait.
With this Tag I think they've replaced the entire movement because previously, winding it was met with great resistance and clunking sounds. I thought I had broken the rotor on it. It was completely broken with no timekeeping at all, ie. a dead Tag.
Come the replacement and it's fine; the watch winds smoothly and I've yet to test the accuracy but am sure it will be acceptable to me. I also got a free case.
I'm almost sure that it is the entire movement they replaced as this watch was dead.