Eterna Datora Dato Compax from 1948.
Fully restored by a Master Watchmaker in its original condition.
Triple Full Calendar
The 13 ligne watch movement is better known by his name Valjoux 72 C.
Along with an hour counter, it possessed a simple full calendar with a pointer date as well a digital weekday and month indication.
The control mechanism for the chronograph is with a column wheel
Original Eta -Eterna manufacture also used by Rolex, Patek Philippe and many high-end branches.