The Omega 30T2PC watch movement is equipped with an Incastar regulator, which is the only widely manufactured regulator that incorporates a free oscillating hairspring. Its design includes two rollers that secure the end of the hairspring, allowing adjustments to its effective length. This ensures exceptional isochronism performance, eliminating errors caused by gaps between regulator pins. The Omega 30T2PC movement features various functions, including manual wind, sweep seconds, date hand, sweep seconds hand, calendar, and a moon-phase display. This mechanical movement was primarily used during the approximate period of 1955.