Andreas Strehler Sauterelle à Lune perpétuelle 2M – The Most Precise Lunar Phase Wrist Watch

Unveiled at Salon QP Exhibition 2014 in London, the Sauterelle à Lune perpétuelle 2M by Andreas Strehler is the most precise moonphase wristwatch ever built. This extra-ordinary mechanical timepiece is available in 18 carat red gold and platinum versions.

At Basel World 2014, the award winning master watchmaker Andreas Strehler presented his Sauterelle à Lune perpétuelle with a practically perpetual indication of the phase of the moon. Now, he has built an even better moon phase: the Sauterelle à Lune perpétuelle 2M.

Andreas Strehler Sauterelle à Lune perpétuelle 2M - The Most Precise Lunar Phase Wrist Watch

The phases of the moon have always fascinated mankind. Luna in Latin and still feminine in many languages, the moon governs the tides, sowing and harvesting.

Andreas Strehler Sauterelle à Lune perpétuelle 2M  watch in Platinum

Unfortunately, the lunar phase cycle is it is not in sync with our calendar: On average, it is 29.530588 days. Hence, for a precise phase of the moon, watchmakers would need cog wheels with fractions of teeth – which doesn’t look good and doesn’t work either.

Andreas Strehler Sauterelle à Lune perpétuelle 2M - The Most Precise Lunar Phase Wrist Watch

If the Sauterelle à Lune perpétuelle had to be corrected every 14’189.5383 yeas by one day, Andreas Strehler managed to improve this value significantly: The Sauterelle à Lune perpétuelle 2M needs such a correction only every two million years – hence the designation 2M. To be quite precise, the correction is needed every 2’060’757 years.

Andreas Strehler Sauterelle à Lune perpétuelle 2M  watch in Platinum

Based on calculations made by Professor Robert Baggenstos, Andreas Strehler designed a completely new gear train for the 2M. Professor Baggenstos has calculated the ratio and Andreas Strehler has turned these calculations into a gear train. For this, the available space inside the movement had to be reallocated and the position of the balance had to be adapted.

Andreas Strehler Sauterelle à Lune perpétuelle 2M watch red gold

All this was done while the size and design of the present Lune Perpétuelle remained unchanged.  In spite of the improved precision of the moon phase indication, Andreas Strehler managed to keep the number of components the same.

Like the Sauterelle à Lune perpétuelle watch presented in Basel earlier this year, the Sauterelle à Lune perpétuelle 2M only needs four components to achieve this feat.

Andreas Strehler Sauterelle à Lune perpétuelle 2M - The Most Precise Lunar Phase Wrist Watch

The Sauterelle à Lune perpétuelle 2M by Andreas Strehler is therefore the most precise phase of the moon ever built. And by some margin: About 2.045 million years. This timepiece has also won the Guinness world records as the most precise lunar phase wristwatch.

Andreas Strehler Sauterelle à Lune perpétuelle 2M - The Most Precise Lunar Phase Wrist Watch

Technically, the Sauterelle à Lune perpétuelle 2M is based on the Sauterelle watch by Andreas Strehler. Like the Sauterelle, the 2M has Andreas Strehler’s unique Remontoir d’égalité. This provides a constant supply of energy to the escapement.

Andreas Strehler Sauterelle à Lune perpétuelle 2M - The Most Precise Lunar Phase Wrist Watch movement

The Lune Perpetuelle 2M is a further example of Andreas Strehler’s technically mature constructions. Using only four components, Andreas Strehler achieves the precision of his moon phase indication by driving it continuously instead of switching it forward once a day.

Andreas Strehler Sauterelle à Lune perpétuelle 2M  watch in Platinum

By a clever combination of internal and external toothing as well as by the use of prime numbers for the numbers of teeth in the cogwheels, Andreas Strehler could represent complex fractions by cogwheels having integral numbers (halve a tooth on a cogwheel does not work in horology – or in general, for that matter).

Andreas Strehler Sauterelle à Lune perpétuelle 2M  watch in Platinum

All this leads to the unprecedented precision of the moon phase indication of the Sauterelle à Lune perpétuelle 2M.

Technical details

Model: Andreas Strehler Sauterelle à Lune perpétuelle 2M

Movement
Calibre Sauterelle Lune 2M, hand winding, 162 parts, frequency 3 Hz / 21‘600 A/h, 32.0 x 30.0 mm, height 5.9 mm, 25 jewels, patented
remontoir d‘égalité, double main spring barrel, edges bevelled and polished by hand, fully decorated movement

Case
18K red gold 5N/ Platinum

Dial
Massive silver dial
Sapphire rim
Blue steel or gold hands

Strap
Hand-sewn alligator leather strap
Buckle: 18K red gold 5N/Platinum

Retail price
Red Gold version: CHF 98,000 (excluding VAT)
Platinum version: CHF 113,000 (excluding VAT)

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