H. Moser & Cie. has possibly the most elegant version of the perpetual calendar watch
The Earth's orbit around the sun takes approximately 365.25 days. To compensate for the extra 0.25 days, a leap year is introduced every four years, ensuring that the calendar year remains closely aligned with the Earth's revolutions around the sun. As such a leap year contains an additional day, February 29, to synchronise the calendar year with the astronomical year.
Mechanical calendar watches that automatically compensate for the leap year are known as a perpetual calendar, which requires a manual adjustment only once every 100 years.
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Above H. Moser & Cie Streamliner Perpetual Calendar Concept Smoked Salmon
The perpetual calendar watch usually features a dial with multiple indications—the day, date, month, moon phase and leap. For H. Moser & Cie., a master of minimalism, this conventional design just won’t do. Redefining what a perpetual calendar could look like, the Streamliner Perpetual Calendar Concept Smoked Salmon retains the clean, uncluttered dial with a couple of surprising details.
Though not obvious at first glance, the watch displays the date, the month, as well as the leap year—it even has a power reserve indicator. The date is immediately discernable via an aperture at ‘4’, which is perfectly aligned with the crown.
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Above The hand at ‘10’ indicates the power reserve while the small red and white month central hand tells you the month
A small central hand in red and white indicates the month—it will point to the hour that also doubles as the month i.e. February is 2 o’clock since it’s the second month of the year, while December is 12 o’clock since it’s the twelfth, and last, month.
The leap year is on the movement side, visible through the sapphire caseback.
The HMC 812 boasts a power reserve of 168 hours, which can be tracked via a hand at ‘10’.

Above The beautifully finished movement parts are complemented with a leap year indication
The watch comes in a steel case with an integrated bracelet with brushed and polished surfaces. What makes it more striking is the smoked salmon dial with a griffé finish.
It is only available for 12 months this year, in celebration of the leap year.
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