Detta står på Omegas hemsida:
Quick date-change on calibres 1120, 2300, 2500, 2601, 2610, 2627, 3221, 3301-3, 3304, 3320, 3313, 3330, 3612, 3888, 3890, 8500, 8501, 8521, 8601, 8611
OMEGA uses the quick date-change system, which starts to change the date at about 11.30 pm and comes to its end at 00.10 am. The date of the ending day can be seen in full until 11.50 pm. Between a period of 10 minutes before and after midnight, the calendar jumps and lets appear the date of the next day.
Avoid changing the date manually between 08 pm and 2 am, since this is the period during which the automatic date-change is in operation.
Och 25318000 har kaliber 1120 så skall ta med pappret till urmakaren för att han inte skall kunna lura mig igen.