Side-by-side at a glance. Click a watch above to open the full reference page.

	Girard-Perregaux 49535-53-151-BK6A	Girard-Perregaux 49555-11-131-BB60
Model	1966 Annual Calendar 40mm	1966 Automatic 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	GP Cal. 03300-0054 -- in-house automatic, 28,800bph, 54h PR, 30j; used in Laureato 38 and 1966 42 Auto; Girard-Perregaux manufacture caliber
Case size	40mm	40mm
Lug-to-lug	48mm	46mm
Years produced	2012–present	2013–present
Brand tier	enthusiast	enthusiast
Era	modern	modern
Movement tier	Unclassified movement	Unclassified movement
Market median (excellent / full-set)	n/a	n/a
Typical range	n/a	n/a
Confidence	low	low
Categories	dress	dress
Editorial	n/a	yes

Girard-Perregaux 1966 Annual Calendar 40mm vs Girard-Perregaux 1966 Automatic 40mm