Breguet 3810 Type XX / Type XXI BrandBreguet CollectionType XX / Type XXI Model3810 Reference3810ST/92/9ZU Country of originSwitzerland Type of watchMen's Case materialSteel Case diameter42 mm Case thickness15.2 mm Power reserve48 hours Water resistance100 m AutomaticChronographHoursMinutesSecondsDateWristwatch