Original vintage 1973 Omega Electronic Chronometer Advert, in French and color.
 
Dimensions: 8.25 inches wide by 11 inches high
 
Per Time&Tide, "Between 1953 and 1959, Hetzel led a team at Bulova that worked on creating a tuning fork-regulated watch that would be even more accurate than any movement before it.  The result was the 1960 release of the first Bulova Accutron.  It was a sensation, and truly one of the first signals that the world was entering 'the space age.'  It boasted an accuracy of +/- 2 seconds per day. It’s no surprise that Bulova’s Accutron models are still making people talk."
 
"At the time of its release, the Accutron was seen as the epitome of 20th-century watchmaking technology, and everyone wanted one.Aside from the improved accuracy, the tuning fork movement’s most obvious visible benefit was the second hand’s lovely smooth sweep.  Moving at a whopping 300Hz, the second hand danced around the dial far quicker than that of a traditional mechanical watch, which was no small feat."
 
But what does the Bulova Accutron have to do with the Omega F300 line?
 
"Fast forward a few years, and Max Hetzel is no longer with Bulova. In 1969, he began working for – you guessed it – Omega.  By this time, his patented tuning fork design with Bulova had been licensed and and modified by Swiss movement maker ESA to create the 9162 and 9164 movements.  They also added the ESA 9210 which had a chronograph function."
 
"Omega, seeing an opportunity to expand even further into the high-tech watchmaking space, decided to use the ESA tuning fork movements in a new line of watches dubbed the Omega Electronic F300.  The F stood for frequency as it often does in physics equations, and the 300 referred to the 300Hz frequency of the tuning fork vibration.  They made their own improvements and modifications to the movement, and added copper plates which make it easy to differentiate the Omega tuning fork movements from other standard ESA versions."
 
"The ESA 9162 became the Omega Calibre 1250, the ESA 9164 became the Omega Calibre 1260, and the ESA 9210 chronograph movement became the Omega Calibre 1255 which was used in the Omega Speedsonic models.  All three were certified chronometers."