Caliber 21

About the Breitling Caliber 21

The 7751 adds a day, a month and a pointer date to the 7750's chronograph, all read from the dial: the day and month in windows at 12 o'clock and the date by a central hand. Breitling's version leaves out the moon phase the base provides and keeps the rest, at 28,800 vph with a 42-hour reserve and 25 jewels, and certifies it with the COSC. The 7750 piece explains the base.

In the library it is the movement of the Montbrillant Datora, a 43 mm chronograph of the 2000s named for the Montbrillant factory in La Chaux-de-Fonds where Breitling made watches from 1892, 33 references, plus one Navitimer at 46 mm. The 43 mm case accounts for 33 of the 34.

The Caliber 13 is the plain 7750 with a date, and the Caliber 23 the 7753 with the horizontal counter layout.