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The perpetual calendar with retrograde date
The perpetual calendar features an ingenious
function: a so-called retrograde date with a flyback
hand that depending on the month and leap-year
cycle automatically flies back to the first day of
the month after the 28th, 29th, 30th, or 31st day. A
spiral spring is responsible for the fast flyback of
the date hand. The clever mechanism was deve-
loped by Patek Philippe in 1986 and further refi-
ned. It requires only little energy and prevents
the flyback hand from bouncing forward after it
Indications, functions, and settings
A
5
1
8
D
4
NOTE ON CORRECTING PERPETUAL CALENDAR (PUSH PIECES
• TO PREVENT DAMAGE TO YOUR WATCH, PLEASE PERFORM ALL SETTINGS AND CORRECTIONS WITH THE CORRECTION
STYLUS THAT WAS SUPPLIED WITH YOUR WATCH. ANY OTHER TOOL COULD DAMAGE YOUR WATCH.
• DATE AND MOON PHASE CORRECTIONS MUST BE MADE AT 7 AM. THIS IS THE ONLY WAY TO ASSURE THAT THE DATE
CHANGE MECHANISMS ARE NOT ENGAGED AND CANNOT BE DAMAGED.
• THE SETTING SEQUENCE DESCRIBED BELOW MUST BE OBSERVED .
DISPLAYS AND FUNCTIONS
2
3
6 7
1- YEAR (IV = LEAP YEAR)
2- MONTH
3- RETROGRADE DATE HAND
4- MOON-PHASE HAND
5- DAY OF WEEK
6- WINDING POSITION
7- HANDSETTING POSITION
8- SLIDE FOR ACTUATING THE STRIKING MECHANISM
9- SUBSIDIARY SECONDS
CORRECTIONS
A-
B-
C-
C
B
9
D-
has jumped back to the first day of the month.
In leap years, the date hand first advances to Fe-
bruary 29 and then jumps directly to March 1 the
next day.
If the watch is worn or kept in a winder every
day, the perpetual calendar will not need to be
corrected until February 28, 2100. The year 2100
is a secular year in which the leap day is skipped
according to the Gregorian calendar.
PUSH PIECES FOR DATE (3), MONTH (2) AND YEAR (1) CORRECTION
PUSH PIECES FOR MONTH (2) AND YEAR (1) CORRECTION
PUSH PIECE FOR MOON PHASE CORRECTIONS (4)
PUSH PIECE FOR DAY OF WEEK CORRECTIONS (5)
A
B
AND
) AND MOON PHASE DISPLAY (PUSH PIECE
C
)
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