to a different coaxial escapement known as the Omega 8500 series with extremely high magnetic resistance. Current Seamaster Professional 300 models continue to use the Omega 2500 "D" series movements.. Valjoux 7750 The Valjoux 7750 a/k/a ETA 7750 an extremely popular movement used in the majority of mechanical chronograph watches on the market in 2004. The Valjoux 7750 uses a three-plane cam system, the coulisse-lever escapement, rather than the traditional chronograph mechanism, the column wheel. 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 7750. In the 1980s, many companies began using the Valjoux 7750 because it was easier to mass-produce and distribute in high-volume. The system and movement were developed by Edmond Capt in 1970, as a fully integrated self-winding mechanism with quick-set day/date based on the Valjoux 7733. The movement is an automatic winding, 25-jewel movement that can be fitted with a variety of features including the triple date (day, date, month and moon phase) or a variety of two and three register models with totalizers or counters for minutes, seconds and hours. It is available in three executions or grades: Elaborated, Top and Chronometer. The key components which differ at the line of demarcation between Elaborated and Top are the pallet stones, balance wheel & hairspring and the regulator mechanism. To illustrate the differences in accuracy garnered by the successive grades, consider the following specifications: Elaborated grade is adjusted in three positions with an average rate of ±5 seconds/day with a maximum daily variation of ±15 seconds; Top grade is adjusted in five positions with an average rate of ±4 seconds/day with a maximum daily variation of ±15 seconds. Chronometer grade must meet strict standards prescribed by the COSC: an average rate of −4/+6 with a maximum daily variation of ±5 seconds. Anti-monopoly investigation In 2003 the Swiss Competition Commission launched an investigation into the business practices of ETA SA after Nicolas Hayek, then chairman of ETA parent The Swatch Group Ltd., announced in 2002 that ETA would shortly stop supplying (partial watch movements) to companies outside The Swatch Group. Competitors complained that this would effectively put them out of business. Hayek countered that Swiss watch making companies must begin to invest in their own movement-making capabilities because it was detrimental to the long term health of the Swiss watchmaking