the RD 5632 is for the perpetual calendar with chronograph with moon phase and yours is a day date-with chronograph with moon phase.
where the biretrographe calendar print at 12 is located- would be the month and leap year indicator for the perpetual calendar-if it had the RD5632.
the chronograph would be the same for both but under the dial the changes would be visible from calendar to perpetual calendar and side correctors in the case
to set the months and leap year .
the movement is stamped no 49 -was the limited edition for this model 50 pieces? making yours one of the last ones made.