The Guba 67.1 watch movement, exclusively manufactured for Mido between 1954 and 1960, features a base plate derived from the AS 1131/1132. It offers optional black rhodium plating and an optional Fonto regulator with a mobile stud carrier and adjustable regulator pin-width. Additionally, the movement can be equipped with the Incastar regulator, which is the only large-scale produced regulator boasting a free oscillating hairspring. The end of the spring is secured between two rollers, enabling the adjustment of its length without isochronism error caused by the gap between the regulator pins. This movement encompasses various functions, including automatic winding, sweep seconds, and a date feature.