Bernhard Zwinz Returns with the Winnerl Chronometer Wristwatch [Updated]

An old Austrian name, finished in Vallee de Joux style.
Winnerl Founders Series 597

Austrian by birth, Bernhard Zwinz now lives and works in L’Orient, a town in the heart of the Vallee de Joux. Breguet, Jaeger-LeCoultre, and Valjoux are just some of the firms nearby. He spent slightly over three years working for Philippe Dufour in the neighbouring town of Le Sentier, before striking out on his own to do finishing and assembly work for prominent brands like Greubel Forsey.

His latest project is a time-only watch inspired by a 19th century Austrian watchmaker Winnerl, but Mr Zwinz actually first came to prominence about a decade ago when he announced a wristwatch with superlative movement finishing. In fact, the, the movement will boast “extreme finishing to the absolute summit of what can be achieved” according to Mr Zwinz, so much so that the escape wheel alone takes five days to finish. That project is still in progress.

The Winnerl wristwatches, however, are almost done, starting with a trio of pre-production, or subscription, unique pieces.

Remembering a fellow Austrian

A series of three one-off wristwatches that are already sold – the serially produced version will arrive later this year –  the Founder’s Series is modelled on by a specific 19th century marine chronometer produced by Joseph Thaddeus Winnerl (1799-1886). Like Mr Zwinz, Winnerl was Austrian, but practiced his craft in Paris, then one of the centres of fine watchmaking. Winnerl was well-known enough that Ferdinand Adolph Lange apprenticed at his Paris workshop for five years starting in 1835.

Winnerl is best known for his invention of the single- and double-hand split-seconds mechanisms, but Mr Zwinz was instead turned to another of Winnerl’s works for inspiration – a maritime chronometer he discovered at an antique watch dealer in Amsterdam several years ago.

winnerl marine chronometer 1931 1

The Winnerl marine chronometer that served as inspiration for Mr Zwinz

winnerl marine chronometer 1931 2

Note the bowl-shaped, split, bimetallic balance

That explains the unusual, directly driven seconds at 12 o’clock, exactly as it was on a 19th century Winnerl marine chronometer. In fact, the entire construction of the movement is based on the marine chronometer, right down to the layout of the gear train and bridges. “The only aspect not directly taken from the original,” explains Mr Zwinz, “is the chain-and-fusee system.”

Winnerl Founders Series 597 movement

Most striking is the large, 13mm, bowl-shaped balance wheel inside the wristwatch, which is essentially a miniaturised version of the same inside the marine chronometer. The rim of the balance is sloped, resulting in the adjustable masses sitting at an angle; this is the only movement using such a balance wheel.

According to Mr Zwinz, one of the key advantages of the bowl-shaped balance is the ability to adjust the screws without removing the balance wheel from the movement, even one that is complete and inside a watch case.

“Every disassembling of the balance from the movement will also have an effect on the oil in the shock absorbing system,” adds Mr Zwinz, “So, it could happen that the oil could spread from the pin into the shock absorbing system when disassembling.”

Additionally, the inclined balance rim allows for finer regulation. “With these screws, one complete turn has only half the normal influence on the balance,” says Mr Zwinz, “This allows for extremely refined timing adjustments to be made.”

Winnerl Founders Series watch balance wheel

Notably, the movement has a short, 32-hour power reserve, the result of Mr Zwinz’s decision to put in a barrel stop mechanism at the 32-hour mark. According to him, that ensures the torque delivered by the barrel is optimal throughout the entire power reserve.

Traditional Swiss finishing

While the movement design is based on a marine chronometer, the finishing is bona fide Vallee de Joux craftsmanship. The bridges are German silver, and hand-finished with details like highly polished anglage, bevelled countersinks, as well as chamfered slots and edges on screw heads.

The use of a 3/4 plate, again inspired by historical Winnerl works, covers everything save for the balance wheel, leaving the movement looking a little flat. The rose gold Founder’s Watch has a striped full plate, while another has a frosted finish, and the last an engraving that replicates the mechanism beneath.

Winnerl Founders Series watch movement

Similar attention is paid to the dials, which are champleve enamel. The dials are first engraved to create a relief of the markings like the hour numerals and minute track. Enamel is then painted around and over the markings, then fired in an oven to set. The hardened enamel is then lapped and polished to reduce its surface thickness until the relief markings show.

The watch case is 40mm in diameter and 10.35mm high, and surprisingly rated to 100m. That is a testament to its robust construction, a quality that Mr Zwinz says will give the case not only longevity but also the ability to be refinished in the future without losing its shape and details.

Winnerl Founders Series watch Bernhard Zwinz

The final detail that connects these watches to Winnerl’s originals are the serial numbers. With antique Winnerl watches known to have reached number 555, according to records at the Bordeaux observatory, Mr Zwinz decided to start the numbering for the Founder’s Series just below 600, with the serially produced models having numbers past 600.

Price and availability

The Winnerl Founder’s Series was priced at 68,400 Swiss francs in white or rose gold, and 87,600 francs in platinum, but all three watches have been spoken for.

However, a serially produced watch similar to the Founder’s Series, with the same movement but featuring a metal dial instead of enamel, will be launched later in the year.


Update April 23, 2019: Included two paragraphs on the purpose of the bowl-shaped balance.

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