Perpetual Calendar Desk Clock — You Never Set It, It Already Knows
How many times have you corrected the date on a clock this year?
Anyone who owns a calendar clock knows the answer: five. After April, June, September and November — each of them 30 days, not 31 — and once more after February.
This clock asks nothing of you.
Hermle's perpetual calendar knows the length of every month, knows the leap year, and works it all out through gears and levers alone — no chip, no programming. Set it once and it runs for decades showing the correct day, date and month.
That is what makes the perpetual calendar one of the finest and hardest complications in mechanical horology.
What Sets It Apart
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Mechanical perpetual calendar — knows every month's length and the leap year, so it never needs manual adjustment
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Full triple display — day, date and month alongside the time
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Limited edition — a collector's piece, not an open production run
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Purely mechanical movement — no electricity, no electronics
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Fine natural wood and high-quality glass — in a dark brown finish suited to an executive desk
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Made in Germany — by Hermle of Gosheim, since 1922
Who Is It For?
For someone who values engineering before appearance. A luxury desk clock carrying a genuine complication rather than decoration — at home on an executive desk, in a majlis, or on the shelf of a private library.
It is also a promotion or milestone gift that gets remembered: a piece that stays on the desk for years and carries a meaning — that the time it measures is worth something.
Specifications
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Product type: Mechanical desk clock with perpetual calendar
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Movement: Mechanical with perpetual calendar (day · date · month)
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Dimensions: approx. 28 × 20 × 12 cm
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Materials: Fine natural wood with an elegant finish · high-quality glass
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Colour: Dark brown
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Edition: Limited
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Country of origin: Germany
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Brand: Hermle
Care Instructions
- Wind the movement at the interval stated for the model, always at the same time of day.
- Move the hands forward only, pausing at every chime or strike until it completes.
- Dust the case with a soft, dry cloth; use a wood-appropriate polish on wooden cases only.
- Clean the glass with a cloth lightly dampened with glass cleaner — never spray directly onto the clock.
- Keep away from radiators, direct sunlight, and humidity, and have the movement serviced by a specialist every few years.
Frequently Asked Questions
What is a perpetual calendar, and how does it differ from an ordinary one?
An ordinary calendar assumes every month has 31 days, so you have to correct it by hand five times a year. A perpetual calendar is a mechanism that knows the length of every month — 28 for February, 30 for April, June, September and November, 31 for the rest — and knows the leap year too. It shows the correct date for decades without you touching it.
Why is the perpetual calendar considered a high complication?
Because it is achieved with gears and levers alone, with no electronics, and requires a mechanism that remembers the full four-year cycle. It is among the hardest things to build in watchmaking, and ranks with the most celebrated mechanical complications.
Does it run on electricity or a battery?
No. The movement is entirely mechanical.
What does "limited edition" mean?
That it is not produced in an open run but in a restricted number — making it a collector's piece rather than a repeating product.
Does it need servicing?
Yes, like any precision mechanical movement — a specialist clockmaker should inspect and oil it every few years.
How large is it?
Approximately 28 × 20 × 12 cm — enough presence for a desk without crowding it.
About Hermle
Franz Hermle & Sohn was founded in 1922 in Gosheim, in Germany's clockmaking heartland near the Black Forest. Within a decade it had become one of the most advanced makers of clock movements in Europe, and it remains among the world's largest manufacturers of mechanical movements. Now in its third generation, Hermle builds every movement in Germany and supplies clockmakers across the globe.
