Catalogue record · Wristwatch
Harwood Self-Winding Wristwatch
Partially verifiedThe commercially viable ancestor of every modern automatic wristwatch: a bumper weight swinging inside the case in place of the winding crown, and the clearest proof that the wristwatch by the later 1920s was being engineered on its own terms rather than as a miniaturised pocket watch.
Overview
John Harwood, a British watch repairer, patented a self-winding wristwatch mechanism in which an oscillating weight, pivoted inside the case and limited to swinging through part of a full turn, winds the mainspring as the wearer's arm moves, striking buffer springs at each end of its swing — hence the 'bumper' name later given to this style of winding.
Because the winding weight made a conventional winding stem and crown unnecessary for day-to-day winding, Harwood's case dispensed with it, using a separate rotating bezel to set the hands instead; this was a genuinely new case architecture designed around the wristwatch's own requirements, not a modification of pocket-watch practice.
History
Harwood filed his British patent in 1923–24 and a corresponding Swiss patent in 1926, and arranged manufacture through Swiss firms including A. Schild for movements, with retailing houses such as Fortis and Blancpain among those selling watches using his system.
The Harwood company traded only briefly, ceasing around 1931 amid the difficult economic climate of the early 1930s; production numbers were consequently modest and surviving examples are correspondingly scarce compared with later mass-produced automatics.
Although later manufacturers, notably Rolex with its full-rotor Oyster Perpetual system from 1931, developed automatic winding further and far more successfully commercially, Harwood's mechanism was the first self-winding wristwatch system to reach genuine, if short-lived, commercial production, and is credited accordingly in the standard histories of the automatic watch.
Design
The bumper weight swings through a limited arc rather than rotating fully, striking spring buffers at each end of its travel — a mechanically simpler, and historically earlier, solution than the free 360-degree rotor used by virtually all later automatic movements.
Dispensing with a conventional crown-and-stem in favour of a rotating bezel for hand-setting is a distinctive, and short-lived, case solution particular to this design; the absence of a winding crown is itself a strong identification feature.
Movement
A. Schild supplied the movements used under Harwood's patent; movement signatures and patent numbers together support attribution, since the watches were sold under various retailers' names rather than only as 'Harwood'.
The bumper mechanism's buffer springs and winding weight pivot are specific wear points not found in ordinary manually wound movements of the period, and servicing requires familiarity with the system.
Case
The absence of a conventional crown stem, combined with a bezel used for hand-setting, is the clearest external identification feature of a genuine Harwood-system case.
Case plating wears through to the base metal on many surviving examples; solid gold examples are less common and, where present, should be verified against hallmarks rather than assumed from case appearance.
Dial and hands
Some dials are signed 'Harwood Self-Winding' or similarly; retailer-branded examples may omit Harwood's name from the dial even though the movement uses his winding system, so the dial signature alone should not be relied on for attribution.
Technical specifications
| Movement | A. Schild calibre using Harwood's patented pivoted-weight bumper winding system |
|---|---|
| Movement type | Manual hand-wound going train combined with an automatic bumper-winding mechanism |
| Escapement | Lever escapement |
| Jewels | Typically 15 |
| Winding and setting | Automatic winding by a pivoted, spring-limited oscillating weight that swings through roughly 180 degrees and strikes buffer springs at each end of its travel — the 'bumper' principle — rather than the full 360-degree rotor of later automatics; a separate rotating bezel is turned to set the hands, since Harwood's design deliberately omitted a conventional winding stem to keep the case sealed |
| Size | Typical for the period, around 30–33 mm |
| Power reserve | Comparable to contemporary manually wound movements once fully wound, though sustaining a full wind depends on the wearer's level of activity |
| Frequency | Period Swiss lever practice |
| Accuracy | Comparable to a good ordinary lever movement of the period; the innovation lies in the winding system, not in a claim to superior timekeeping |
| Complications | No running seconds in most examples; the winding mechanism itself is the watch's notable feature rather than a dial complication |
| Winding system | Pivoted bumper weight, patented by John Harwood |
| Hand-setting | By rotating bezel; no conventional winding crown |
| Movement supplier | A. Schild |
| Production span | c. 1926 – c. 1931 |
Identification
- No conventional winding crown and stem; a rotating bezel used instead to set the hands is the single clearest identification feature.
- A. Schild movement signature together with Harwood patent markings inside the case supports attribution where the dial itself does not name Harwood.
- Very short production run (c. 1926–1931) means genuine examples are scarce; claims of Harwood manufacture should be checked carefully against movement and case features rather than accepted from dial wording alone.
Variations
- Sold under Harwood's own name and under various retailing houses including Fortis and Blancpain, using the same underlying winding system.
- Base metal, gold-plated and solid gold cases all occur; plating condition varies enormously depending on wear and any later refinishing.
Serial numbers and dating
- No comprehensive published serial-number register comparable to the major American factories is available for this short, multi-retailer production run; attribution rests on patent markings, movement signature and case construction rather than a serial sequence.
Known examples and institutional holdings
- Examples are held in specialist horological museum collections as documented early automatic wristwatches; such museum-catalogued examples are a useful comparison point for identifying a genuine Harwood-system watch.
Collecting
- Collected specifically for its place as the first commercially produced self-winding wristwatch system, ahead of Rolex's later full-rotor development.
- Because the type is scarce and historically significant, verify the absence of a winding crown, the bezel hand-set, and the movement signature together before relying on a dial signature alone.
Restoration and conservation
- The bumper winding mechanism's buffer springs and weight pivot require a watchmaker familiar with this specific and now uncommon system; do not treat it as an ordinary manual movement for servicing purposes.
- Preserve original case plating and dial signatures where present rather than refinishing for a bright, uniform appearance.
- Movement work — cleaning, lubrication, mainspring replacement, pivot or jewel work — belongs with a qualified watchmaker. Conserve original parts; do not refinish dials or polish cases to remove honest wear.
Bibliography
- Specialist reference works on the history of the automatic wristwatch and on John Harwood's patents (consult current editions).
- Manufacturer and retailer histories for A. Schild, Fortis and Blancpain covering the late 1920s.
Bibliographic entries are given only at the level we can support. Where an edition, publisher or ISBN is not confirmed, it is deliberately omitted rather than invented.
Diagram
Sources & references
- Published specialist histories of the automatic wristwatch crediting Harwood's patented system.
- Patent office records for Harwood's British and Swiss self-winding watch patents.
Where sources disagree, the disagreement is stated rather than resolved silently.