Omega Chrono-quartz

This one was launched at the Montreal Olympic Games of 1976, the OMEGA Chrono-Quartz, the first "hybrid" watch in the world with both analogue display for the time functions and LCD (liquid crystal digital) display for the chronograph functions, the two driven by the same quartz resonator

Info from omega site.

Specifications

Age: 1977

Calibre:1611

Serial nr. 40'103'545

Case Ref: ST 196.0052

Measurements:

47mm without the crown

50.6mm including the crown and buttons

34mm from lug to lug

Band with=28mm