2012–present · 40mm · caliber GP Cal. GP03300-0115 -- in-house automatic annual calendar, 28,800bph, 54h PR; three-window annual calendar corrects automatically at month-end except Feb/Mar; used in 1966 series
—eBay asking prices. Condition and box/papers status not filtered.
Stable over the past 90 days
Based on eBay sales, last 12 months
Condition affects price
Pre-owned watches trade across a wide condition spectrum. These ranges are typical for the secondary market.
New Old Stock
Unworn example retaining original packaging, tags, and warranty documentation.
$8,549–$9,864
+30–50% vs median
Unpolished
Worn but the case has never been polished; original brushed and polished surfaces are intact.
$7,562–$8,220
+15–25% vs median
Polished
Case has been professionally or amateur polished at some point; edge definition is softened.
$5,590–$6,247
-15 to -5% vs median
Recently Serviced
Movement has been recently serviced with documented service records; case condition varies.
$6,576
At median
Movement tier: unclassified · caliber GP Cal. GP03300-0115 -- in-house automatic annual calendar, 28,800bph, 54h PR; three-window annual calendar corrects automatically at month-end except Feb/Mar; used in 1966 series
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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The later Cal. GP03300-0115 annual calendar has a longer power reserve than the earlier GP033R0; verify the specific caliber through the caseback.
Known issues in the market
Two distinct annual calendar variants exist in the 1966 case; the caliber number on the caseback or in the papers is the only reliable way to distinguish them.
Mixing papers from one variant with a watch of the other variant is a documentation fraud; the caliber in the papers must match the caliber visible through the caseback.
Area
What to check
What is correct
Red flag
caseback
Caliber designation matching papers
Caliber text on caseback matches the caliber listed in accompanying papers; GP03300-0115 for the later variant
Caseback caliber does not match papers; GP033R0 text on a caseback accompanied by GP03300-0115 papers
movement
Power reserve consistency with stated caliber
Later Cal. GP03300-0115 base has 54h power reserve; earlier GP033R0 has 46h
Power reserve running down faster than specified; inconsistency between stated caliber and observed reserve
dial
Annual calendar aperture function
Day, date, and month all advance correctly; month disc correct for 30 and 31-day months without manual correction
Authentication guide
Last reviewed June 2026
This second 1966 Annual Calendar variant uses the same GP03300-0115 movement architecture in an alternate case material and dial configuration. The authentication approach is identical to the primary 1966 Annual Calendar: verify the round case, the annual calendar function, and the movement finishing.
Known reproduction risks
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LOW
Replicas targeting this specific variant are very uncommon. The greater risk is a primary variant (49535-11-131-BB60) with documentation misidentifying it as this second variant.
Case material inconsistent with the stated reference number
Calendar function that does not advance automatically at month-end
Movement through caseback inconsistent with the GP03300-0115 architecture
Month disc requiring correction outside of end-of-February; any aperture advancement error
Common legitimate replacements
Papers are part of the collectible value on GP annual calendars; the specific caliber number in the papers must match the movement.
Service history documentation is important; annual calendar service requires GP or equivalent specialist credentials.
Expert resources: Girard-Perregaux press materials at girard-perregaux.com. TimeZone GP forum for annual calendar variant identification by caliber number.
Alternate material and dial configuration of the 1966 Annual Calendar. The round case and annual calendar complication remain constant; the dial color and case material distinguish this variant from the 49535-11-131-BB60.
Round case consistent with the 1966 family architecture
Annual calendar three-window display for day, date, and month
Alternate case material indicated by the reference suffix (e.g., black ceramic or different metal)
"Girard-Perregaux" and "1966" text in the correct typeface
"Annual Calendar" text on the dial
Service part flags
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Case material
Original: The variant suffix (49535-53-151-BK6A) indicates a specific case material configuration. Any discrepancy between the stated case material and the actual material is a significant flag.
Replacement tells
Case material that does not match the stated reference suffix, suggesting a case swap or incorrect identification
Mismatched case and bracelet materials
Annual calendar function
Original: Same Cal. GP03300-0115 function as the primary variant. The calendar corrects automatically at month-end except February.
Replacement tells
Calendar that requires manual correction at months other than February
Calendar displays that advance in multiple steps at midnight rather than a single jump
Case back markings
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Current production
Exhibition caseback displaying Cal. GP03300-0115
"Girard-Perregaux" and "Genève" on the movement
Reference 49535-53-151-BK6A on the case band
54-hour power reserve movement
Movement tells
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Cal. GP03300-0115 is an annual calendar variant of the GP03300 family at 28,800bph and 54-hour power reserve. This variant has a longer power reserve than the GP033R0 in the primary 1966 Annual Calendar.
The three-window annual calendar display should advance cleanly and simultaneously at midnight. Any hesitation or partial advance indicates a worn or incorrectly lubricated date jumper.
GP finishing standard applies: Côtes de Genève on plates, decorated rotor.
