Premier Heritage B15 Duograph 42 Stainless Steel / Blue

In Context

At 42 mm it is sized to the current mainstream: 40 mm is the median across every watch measured in this catalogue. The case back is open, so the movement is visible without taking the watch apart, and the sapphire crystal will resist everything short of deliberate abuse. 100 m is genuine swimming resistance — more than the shape of this watch suggests it would need.

The movement is hand-wound, so winding it becomes part of the day rather than something the watch does for you. 70 hours of reserve is enough to set it down on Friday evening and find it still running on Monday. At 28,800 vph the seconds hand advances 8 times a second.

AB1510171C1P1 stands on its own in this catalogue — no other reference here shares its base number. It pairs a blue sunburst dial with a stainless steel case. Introduced in 2021.

A hand-wound split-seconds chronograph drawn from Breitling's in-house B01 architecture. Duograph is the name Breitling used in the 1940s for a rattrapante: two chronograph hands run together until one is stopped to read a split time, then catches the other up. It is chronometer-certified, and the mechanism carries two patents Breitling took out to simplify it and sharpen its accuracy.

1 other watch in the library runs the Breitling Caliber B15.

Breitling

Premier Heritage B15 Duograph 42 Red Gold / Black

RB1510251B1P1 · 42 mm