Editorial
The Navitimer B01 43mm is the current production Navitimer built around Breitling's own caliber B01, a movement Breitling developed entirely in-house after years of relying on supplied ebauches. At 43mm it sits at the middle of the Navitimer size range, which makes it the most wearable option for buyers who find the 46mm too large. The slide rule bezel is fully functional and still used by pilots for flight calculations, not a decorative afterthought.
Breitling introduced the B01-powered Navitimer in 2017, marking the first time the reference carried a fully proprietary column-wheel, vertical-clutch chronograph movement rather than a Valjoux or ETA base. The AB0138241B1A1 is the current 43mm reference in steel on a bracelet with a black dial, introduced as part of the post-2017 lineup under the Breitling rebranding effort led by CEO Georges Kern. Earlier Navitimers used the Valjoux 7750 and, before that, the Valjoux 72 in vintage references going back to 1952.
The B01 is COSC certified, rated to -4/+6 seconds per day, and runs at 28,800 vph with a 70-hour power reserve. No significant case or movement revisions have been made to this generation.
Confirm the reference number rather than relying on dial appearance alone, as Breitling makes the Navitimer B01 43mm in a wide range of dial colors and strap configurations that share similar aesthetics but differ in value on the secondary market. The bracelet clasp on early production examples showed wear faster than expected; inspect the deployment clasp teeth and butterfly mechanism closely on pre-owned pieces. Chronograph pushers on slide-rule bezels accumulate grime at the bezel teeth, which is cosmetic but worth factoring into a pre-purchase inspection.
Box and papers carry more weight with Breitling buyers than with some other brands, so missing papers have a more pronounced effect on resale price here. Service history documentation is worth asking for on any example with visible pusher or crown wear.
