Harwood 1926: the origins of the crownless automatic wristwatch
· Mamontrevintage
Before the Oyster Perpetual and full-rotation rotors, wrist movement could already wind a watch. John Harwood's system combined an oscillating weight with limited travel, time setting through the bezel and a case without a side-mounted crown. It was a decisive innovation in wristwatch history.
John Harwood: a British inventor in the 1920s
In the first decades of the twentieth century, wristwatches gradually replaced pocket watches. Yet daily winding still required turning a crown, repeatedly exposing the mechanism to possible moisture and dust ingress. This challenge inspired British watchmaker John Harwood, born in 1893, to develop a winding system powered by the wearer's movement.
John Harwood worked on an initial experimental design as early as 1922. His invention was the subject of a British patent application in 1923, which became patent GB 218487 in 1924. Swiss patent CH 106583 was also granted in 1924. The project illustrates the difficulty of turning a patent into production: beyond the concept, it was necessary to manufacture small, robust components reliably and repeatedly.
Fortis, A. Schild and Blancpain: bringing the invention into production
The project found industrial partners in Switzerland. The company Fortis, established in 1912 by Walter Vogt in Grenchen, helped bring the watches to market, while movement manufacturer A. Schild provided production capacity. Fortis dates the industrial launch of its Harwood watches to 13 July 1926, a major milestone in automatic-watch history.
The Harwood patent is also associated with Blancpain, a Swiss manufacture whose history reaches back to 1735. Watches connected to this dual commercial history were distributed from the 1920s. The inventor's name, a manufacturer's signature and the patent inscription can occur within the same product lineage, united by the winding mechanism.
The Science Museum in London holds a late-1920s Harwood with a silver case, stop-limited oscillating weight and bezel-operated time setting. This museum piece provides valuable physical evidence of how the invention worked.
A stop-limited movement: an automatic unlike modern rotors
The Harwood system uses a moving weight travelling through a limited arc. As the watch moves, the weight oscillates and stops against spring-cushioned bumpers. This back-and-forth movement drives the mainspring-winding mechanism. Known as a bumper or oscillating-hammer system, it differs from a rotor capable of a complete 360-degree turn.
The absence of a crown is its second unusual feature. The rotating bezel operates the time-setting mechanism, eliminating the conventional control on the side of the case. On some variants, a small coloured aperture in the dial indicates the setting mechanism's position. The watch thus combines two innovations: automatic energy supply and time setting without a traditional crown.
The stop-limited weight receives an impulse when the wrist moves, but captures energy differently from later full-rotation rotors. The enduring success of modern systems does not diminish the significance of this early industrial solution.
A 30 mm Harwood around 1926
A Harwood with a Blancpain patent of modest dimensions, measuring about 30 mm, shows the transition from early-century dress-watch conventions to the first automatic solutions. The case retains typical 1920s proportions, while the lack of a crown gives it a strikingly clean silhouette.
The dial becomes easier to understand once the bezel's operation is known. The Harwood's distinction is not a visible complication with registers: it lies in its winding system, hidden inside the movement and operated externally through the case design.
Legacy: an invention that became universal
Automatic winding mechanisms existed in pocket watches long before Harwood. The British inventor's contribution lies in the development of an industrially produced automatic wristwatch. Later solutions, especially full-rotation rotors, developed the principle further and improved its efficiency.
Harwood's commercial fortunes declined during the economic crisis of the 1930s. His technical legacy survived: the crownless watch with its time-setting bezel remains a landmark where mechanical innovation met Swiss serial production.
Sources and documentation
- British Museum — Harwood: patents, production and oscillating-weight winding.
- Science Museum Group — Harwood self-winding wristwatch, circa 1928.
- Fortis — A Century of Automatic Watchmaking (1924–1926 timeline).
- Vintage Watch Straps — John Harwood's patents and the history of Fortis.
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