Hi Ed,
It's the Bulgari Collection Gerald Genta Octo Repetition Minutes Retro which features a minute repeater with jumping hour and retrograde minutes. There is a sliding bolt that you can select to strike the hours, quarters and minutes.
Here's a freeze frame of the video, and if you look at it very carefully you can see two crowns; the one at 3 o'clock position is the normal crown to operate the time, and the 9 o'clock activates the repeater mechanism:
