1966 Annual Calendar 40mm

Name: Girard-Perregaux 1966 Annual Calendar 40mm 49535-11-131-BB60
Brand: Girard-Perregaux
SKU: 49535-11-131-BB60

Ref. 49535-11-131-BB60

2016–present · 40mm · caliber GP Cal. GP033R0: in-house automatic annual calendar, 28,800bph, 46h PR; used in 1966 Annual Calendar; requires setting just once a year at end of February

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Movement tier: unclassified · caliber GP Cal. GP033R0: in-house automatic annual calendar, 28,800bph, 46h PR; used in 1966 Annual Calendar; requires setting just once a year at end of February · 46h power reserve

Medium-large: suits wrists 6.5 in+ (16.5 cm+)

40 mm case. Wears confidently on average to larger wrists. May overhang on slender builds.

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Authentication

The annual calendar day, date, and month apertures must all advance correctly; a lagging month disc is the most common service indicator.

Known issues in the market

Annual calendars only need manual correction once per year at the end of February; any example that requires more frequent correction has a service issue.
The moonphase variant adds a disc at 6; a missing moonphase on a caliber that specifies it indicates dial or movement substitution.

Area	What to check	What is correct	Red flag
dial	Annual calendar aperture advancement	Day, date, and month apertures all advance cleanly at midnight; month disc advances correctly through 30 and 31-day months automatically	Month disc that does not advance at month-end; any aperture that lags or advances at the wrong time
dial	Text printing in apertures	Day, date, and month text is correctly formatted and centered in each aperture; font matches GP specification	Misaligned text in any aperture; incorrect font or size; text that is not fully visible when centered
movement	Cal. GP033R0 via caseback	Exhibition caseback showing GP in-house annual calendar movement with correct caliber designation	Non-GP movement; standard date-only movement substituted for annual calendar caliber

Common legitimate replacements

Annual calendar mechanisms are complex; service should be performed only by GP-certified watchmakers.
Leather straps are frequently replaced; factory GP straps have GP-signed buckles with correct finishing.

Expert resources: Girard-Perregaux 1966 annual calendar documentation at girard-perregaux.com. WatchUSeek GP subforum for annual calendar service and function testing.

Authentication guide

Last reviewed June 2026

The 1966 Annual Calendar is the complication flagship of the 1966 round case family. Cal. GP033R0 advances the calendar automatically at month-end, requiring just one correction at the end of February each year. Testing the calendar correction is the most direct functional check.

Known reproduction risks

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LOW

Replicas of the 1966 Annual Calendar are uncommon given the complexity of replicating a functional annual calendar mechanism. A non-functional calendar advance is the most common tell on any replica that attempts the complication.

Calendar displays that advance in multiple steps rather than a single jump at midnight
Month display that does not correct automatically at month-end
Case proportions inconsistent with the 40mm 1966 round case format

Dial variants by era

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Era	Description	Identifiers
Current production 1966 Annual Calendar	Clean round dial with three calendar windows or apertures for day, date, and month. The GP annual calendar mechanism displays all three simultaneously without requiring manual correction except at February/March transition.	Round case, no integrated bracelet, thin polished bezel, consistent with the 1966 family Three calendar displays for day, date, and month in consistent aperture format "Annual Calendar" text on the dial, typically below 12 "Girard-Perregaux" and "1966" text in the correct typeface Moonphase display at 6 o'clock on moonphase-equipped variants

Service part flags

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Annual calendar mechanism

Original: Cal. GP033R0 automatically corrects at the end of months with fewer than 31 days, except February. The calendar mechanism should advance at midnight with a clean, decisive jump. The day, date, and month displays should all align simultaneously.

Replacement tells

Calendar that advances in more than one motion at midnight rather than a single clean jump
Month display that does not match the actual calendar month after setting and running for several days
Day display that does not correspond to the correct day of the week for the current date

Case architecture

Original: The case must be the round 1966 format, not the Laureato octagonal or Vintage 1945 rectangular form. Any non-round case architecture indicates a movement in a wrong case.

Replacement tells

Octagonal bezel on a stated 1966 Annual Calendar
Integrated bracelet attachment geometry, which does not belong in the 1966 family

Case back markings

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Current production

Exhibition caseback displaying Cal. GP033R0
"Annual Calendar" or calendar complication reference on the movement
"Girard-Perregaux" and "Genève" on the movement plate
Reference 49535-11-131-BB60 on the case band
46-hour power reserve; the watch should be wound if calendar correction testing is required

Movement tells

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Cal. GP033R0 runs at 28,800bph with a 46-hour power reserve. The shorter power reserve relative to the standard GP03300 is characteristic of the annual calendar variant.
Annual calendar mechanisms require correct lubrication of the month-corrector cam and the date jumper. A calendar that hesitates at month-end after a service interval suggests dried lubricant.
GP finishing standard applies. The movement visible through the caseback should show Côtes de Genève striping.

Sources: Girard-Perregaux -- 1966 Annual Calendar complication documentation.