Ebauche

An ebauche is a movement blank: the plates, bridges, train wheels, barrel and often the keyless works, supplied without the regulating organ, without finishing and without adjustment. Somebody else adds the escapement components, adjusts it, decorates it, and puts it in a watch.

The word is French, pronounced roughly ay-BOSH, and it means a rough draft. The Swiss trade splits a mechanical movement into three purchases, and the split still explains most of what you read on a spec sheet. The ebauche is the blank. The assortment is the regulating set: escape wheel, pallet fork, balance wheel and hairspring, made by a small number of specialists because the metallurgy and the tolerances are the hardest part of the whole watch. The third purchase is labor: assembly, adjustment in several positions, and finishing. A company that buys all three and sells the result under its own name is an etablisseur, and that trade, etablissage, is how most Swiss watches have been built since the eighteenth century.

Where the trade came from

Most of the Swiss watch industry was built this way. A small brand could not possibly design and tool a movement from nothing, so it bought a blank from a specialist and concentrated on the watch. That division of labour is why ETA and, later, Sellita became the quiet center of the industry.

The consolidation is worth knowing because it shaped who supplies whom today. Ebauches SA was formed in the 1920s to group the Swiss blank makers, among them A. Schild, Fontainemelon and the predecessors of ETA, and it later sat inside the industrial holding ASUAG. The surviving houses were merged under the ETA name in the mid-1980s, and ETA is now part of the Swatch Group. What had been dozens of independent blank makers became, in effect, one.

That is the background to the modern argument. In 2002 ETA told its customers it would stop selling ebauches and supply only finished movements. Switzerland's competition commission, COMCO, intervened, found ETA dominant in Swiss-made mechanical ebauches priced up to CHF 300, and required continued supply under settlements that finally expired at the end of 2019. The full sequence, with dates, is on our page for the Sellita SW200-1, the caliber that exists because of it.

What finishing and adjustment actually change

The numbers make the point better than adjectives. Sellita publishes four grades of the same caliber, separated only by the quality of the regulating parts and the care of adjustment: Standard at plus or minus 12 seconds a day in two positions, Elabore at 7 in three, Top at 4 in five, and a Chronometre grade adjusted to COSC criteria. Same blank, same architecture, a threefold spread in rate specification and a considerable spread in price. ETA grades its calibers on a similar ladder without publishing the tolerances. The comparison of the ETA 2824 against the Sellita SW200 sets the two side by side, and the reference pages for the ETA 2824-2 give the published dimensions.

Why the word matters commercially

The line between an ebauche a brand finishes to its own specification and a complete bought-in movement it simply drops in is blurred, and brands exploit the blur. Both get called "our caliber". Neither is dishonest exactly, and neither tells you much about quality on its own: a well-finished, well-regulated ebauche beats a badly executed in-house movement every time.

Read the specifics rather than the label. Our answer on what an in-house movement actually is and the comparison of in-house against third-party movements set out what to look for.

The common confusions

An ebauche is not a clone or a copy. It is a legitimate product sold openly, with a catalog, part numbers and a data sheet. Nor does it mean cheap: some of the most admired vintage chronographs from the great Geneva houses are built on Valjoux bases, and the value there was always in the finishing, the casing and the adjustment.

The word is also close to obsolete in its strict sense. ETA and Sellita now sell complete, running, regulated movements rather than blanks, so a modern brand that says it buys ebauches usually means it buys movements. And the term is specifically Swiss. Miyota and the Seiko NH series are sold as finished calibers to anyone who orders them, which is why the same movement turns up in dozens of unrelated microbrand watches. What survives is the useful distinction: ask which base, whose assortment, and who did the adjusting. Decoding marketing claims works through the rest of the vocabulary.