Leap year indicator is on the back side, on the theory that you don’t need to look at it often. It’s the circular disc: Watchfinder did a great video on this watch a few years ago if you’re interested: https://m. ...
Everything else is done via the crown. It is also one of the rare perpetual calendars that can be set backwards or forwards, and it has an 8 day power reserve, so it’s much less of a hassle to maintain than your average perpetual.