Caliber 19

About the Breitling Caliber 19

It shows the day, the date, the month and a moon phase beside the chronograph, and the calendar knows the length of every month except in a leap year, which is the 1,461-day cycle. The base is the 7750 family, cam-actuated with a horizontal clutch, running at 28,800 vph with a 42-hour reserve; the module brings the jewel count to 38. Every one is COSC-certified.

In the library it powers 11 Transocean Chronograph 1461 references, 6 Navitimer 1461s at 48 mm, 4 Super Chronomat Four-Year Calendars, 3 Montbrillant Olympus, 3 Chrono-Matics and 3 Bentleys. Cases run from 42 mm to 48 mm, with 43 mm the most common.

The Caliber 21 is the 7751 with a full calendar but no leap-year logic, and the glossary defines the annual calendar the four-year calendar sits beside.