Omega caliber 1611
Omega's caliber 1611 Chrono-Quartz is a remarkable movement.
It was developed in-house by Omega and it is said that (pre-)production movements were ready in 1975, although it would not be commercially available until one year later. It was at the time one of the first hybrid (analog-digital) movements available; Zenith's Futur was released slightly earlier.
The Chrono-Quartz movement more or less consists of two different movements which use one single quartz resonator. It's 'Albatros' moniker is derived from the distinct shape of the clamp for the two batteries.
The digital displays can be used for timing or to display the running seconds. The analog half is similar to other Omega quartz movements from the time; the minute hand is advanced by pushing the crown, while the hour hand can be adjusted in one hour increments by pulling and turning the crown.
This movement was notably only used in the 1976 Montreal Olympics Chrono-Quartz.