The Universal Geneve 218-27 watch movement, which was used between 1969 and 1972, features a ball-bearing rotor and a ball-bearing crown wheel. It also utilizes an excenter regulator mechanism. The 138 movement is functionally identical to the 2552PC movement. The watch movement incorporates automatic winding, a sweep second hand, and a calendar function that allows the date to be adjusted by changing the time between 19-24 hours.