Omega pulled back the curtain on the Chronostop in 1966, marketing the new, fresh style under their popular Seamaster line. Ultimately being transferred to the Geneve collection only a year later, the Chronostop was a more modern, sportier take on their more well known tool chronograph line.

Driven by the Lemania-produced calibre 865 manual-wound movement, the Chronostop introduced a press and release stop-second feature, engaged by the single pusher at 2 o'clock.  While various dial colors and configurations, more complications and different case designs rolled out in subsequent years, the original Chronostop was produced with four different color dials and a barrel-shaped stainless steel case, sun-brushed bezel and a polished and faceted conical case design.

This particular execution dates to approximately 1968 and features the caliber 920, the successor to the caliber 865 which offered the added function of a date window at 3 o'clock, a satin finished case, brilliant blue dial with minute circle and strokes to the fifth of a second, brilliant white hour and minute hands and a bright orange sweep hand - a truly stunning example of an unusual chronograph!