La Cote des Montres : Enchères Omega "Constellation" Chronometer, Electronic F300 Hz. Produced circa 1970. Very fine and rare center-seconds, water-resistant, stainless steel gentleman's electronic wristwatch with date and a stainless steel
Omega F 300 | Chrono24
Montre omega electronic F300 Hz avec jour et date, ne fonctionne pas… | eBay
Montre Omega Vintage Seamaster F300 Electronique Acier Vers 1970.
Test Omega Seamaster F300 Hz Chronometer | The Watch Observer