The perpetual calendar was first introduced into Moser’s collection in 2005, and like the Smoked Salmon dial, it doesn’t adhere to the norm. Where every other high-end watchmaker was adding more to their perpetual calendars, Moser figured out that all anyone really needed from their perpetual calendar was the date.
To keep the date accurate, changing at the right places on short months and especially at the end of February, taking into account the four year leap cycle, all that extra information can’t be done without. Here’s how Moser packaged it all away.
The date is large and prominent at four o’clock on the dial, and changes instantly at midnight, so there’s no lazy swap from one to the other over several hours. That’s the good bit. We need that bit. The crown can be adjusted both forwards and backwards without any costly trips to the service centre. The next thing that’s needed is the month. Given that there are twelve months in the year and twelve hours on the dial, it makes sense to get a twofer and get them doing double duty. So there’s a vestigial hand at the bottom of the stack that indicates the month.
Lastly what’s needed is the position in that four-year leap cycle, and that can be found on the back of the calibre HMC 812. There’s a hidden pusher at 10 o’clock, roughly where the power reserve display points, and that advances the leap disc forward.
Oh, and whilst you’re there, you might as well stop to admire the partially skeletonised base plate, big screwed chatons and the doubled-up striping complete with a dark grey finish. There’s no rotor weight clogging the view, and its absence keeps the 42.3mm case at an ideal height of just 11mm without the crystal. The tiny lugs make that case diameter very comfortable on almost every wrist.
This timepiece comes with a power reserve, indicated at nine o’clock, of 7 days thanks to the double barrel of the HMC 812.