With the exception of hairsprings manufactured by sister company Nivarox , ETA maintains vertical control over the manufacturing of all of the components required to create a watch movement and therefore is considered a true manufacture d'horlogerie.
History[ edit ] ETA is the result of successive consolidation of the Swiss watch industry, a combination of several former Swiss watch movement manufacturers including Valjoux , Peseux   and Lemania. In at Grenchen , Urs Schild, a schoolmaster, and Dr. By consolidating companies that produced high-quality movements and a number of watch brands, SSIH gradually established a strong position in the Swiss watch industry. ASUAG had been founded in ASUAG expanded through the purchase of companies that made movement-blanks and a number of finished watch manufacturers that were subsequently brought together under the subsidiary General Watch Co GWC.
Foreign competition and the mass production of cheap new electronic products were taking over the market. Invented, developed and launched by Ernst Thomke and his team.
At that time, Nicolas G. Hayek, as newly elected Chairman of the Board and main shareholder had already become the only person of reference. Standard, Elaborated improved , Top and Chronometer. In contrast, since the addition of the "-2" at the end of the movement number, there has been no difference between the standard and the chronometer grades in terms of the regulator mechanism, both being Etachron.
To illustrate the differences in accuracy garnered by the successive grades, consider the following specifications: Chronometer grade movements are serial numbered, as that is a requirement of the certification authority. Moreover, it should be noted that the degree of decoration on the movement's parts, generally only an aesthetic improvement, increases as well with the grade. A2  is a newer design dating to the s and fitted with top quality components.
An automatic winding, twenty-one 21 jewel movement, the is available in three executions or grades: Elaborated, Top and Chronometer. The degree of decoration on the movement's parts also increases with the grade.
The wider range for the chronometer grade is designed to take into account the differences in a watch's rate between static positions, as when the tests are performed, and the dynamic positions as when a watch is actually worn. Chronometer grade movements are serial numbered. A2 is usually found in the more expensive and prestigious watches and brands, and owing to its relatively slim height of 3. A2 is a favorite of watch brands that market complicated movements such as Breitling with its trademark chronograph stop watches.
The is also used in certain International Watch Company watches, including newer Ingenieur models introduced in A2 known as the Omega Later versions of the Seamaster used a proprietary coaxial escapement invented by George Daniels , an English horologist, and exclusively marketed by Omega , a sister company of ETA.
The movement with the coaxial escapement is known as the Omega series and is derived from the ETA Later versions of the Seamaster "Planet Ocean" migrated from the Omega to a different coaxial escapement known as the Omega series. Current Seamaster Professional models continue to use the Omega "D" series movements. It is constructed of a mainplate, calendar plate, and chronograph top plate.
Levers push a cam back and forth, driving the stopwatch mechanism of the Valjoux In the s, many companies began using the Valjoux because it was easier to mass-produce and distribute in high-volume. It is available in three executions or grades: Chronometer grade must meet strict standards prescribed by the COSC: Competitors complained that this would effectively put them out of business. The number of Nivarox products that must be offered will be reduced gradually, dropping by 70 percent by the year