https://www.timeline.watch/watch/1972-omega-constellation-electronic-f300-hz-ref-198-0022/#:~:text=The%20f300%20movement%20was%20developed,%2C%20Tissot%2C%20Omega%2C%20etc%E2%80%A6

The f300 movement was developed by ESA, an update by Max Hetzel of the original Bulova tuning fork . ESA supplied these to many companies inc; Longines, IWC, Baume & Mercier, Tissot, Omega, etc…Omega were their largest customer by far, all Omega movements have a gilt finish compared to the Geneve stripes of the other marques. The Omega f300 chronometers were tested to mechanical movements standards and they easily pass. Although more accurate than mechanical movements, tuning fork movements were quickly replaced by quartz movements, which became cheaper to produce and more accurate.