The Ronda 2538 watch movement, produced from 1970 to 1975, features a variable calibre signature towards the end of its production interval. The movement incorporates an indirectly driven minute hand mechanism, enabling the utilization of a large balance and a low-profile design. Furthermore, this movement is known to offer different rotor shapes. With regards to its functions, the Ronda 2538 movement includes automatic winding, sweep seconds, and a date function that can be adjusted by changing the time to between 19:30 and 24:00 hours.