Breitling · Navitimer and Chronomat
Breitling AB0138241C1P1 vs Breitling AB0158101A1A1
10 published specifications differ between these two, and 7 are identical. Every figure below is what the manufacturer states for that reference; nothing is inferred from the other watch.
What differs
| Specification | ||
|---|---|---|
| Case | Stainless steel, 43 mm | Stainless steel, 42 mm |
| Diameter | 43 mm | 42 mm |
| Thickness | 13.69 mm | 13.77 mm |
| Lug width | 22 mm | 20.05 mm |
| Water resistance | 3 bars (30 m / 99 ft) | 20 bars (200 m / 660 ft) |
| Crystal | Cambered sapphire, glareproofed both sides | Sapphire |
| Bezel | Bidirectional, slide rule | Unidirectional, ratcheted |
| Dial | Ice blue, as stated in the page description | White, as stated in the page description |
| Crown | Non screw-locked, two gaskets | Screw-locked, two gaskets |
| Bracelet | Alligator leather strap, black, straight, 22/18 mm | Stainless steel bracelet, straight, 20/20 mm |
What is identical
Worth knowing as much as the differences: these are the specifications you cannot use to tell the two apart.
- Case back
- Screwed in (sapphire crystal)
- Calibre
- Breitling 01 (Manufacture)
- Movement
- Self-winding mechanical
- Power reserve
- Approximately 70 hours
- Frequency
- 28,800 v.p.h
- Jewels
- 47
- Movement notes
- Chronograph to 1/4th second, with 30-minute and 12-hour totalisers. Calendar shown in a dial aperture.
Stated for one, not the other
These rows cannot be compared, because one maker publishes the figure and the other does not. An empty cell is a gap in the manufacturer's documentation, not a gap in the watch — and not a licence to fill it in from the other column.
| Clasp | Stainless steel folding clasp, 18 mm | not stated |
|---|
What the differences cost you
Each note below follows from the published figures in the tables above — what they mean for intake, for a listing, and for the handover. Nothing here estimates a price or a margin.
Do not describe these the same way
The AB0138241C1P1 is rated to 30 metres and the AB0158101A1A1 to 200. A rating is a factory figure for a new watch with fresh gaskets, not a promise about a used one — but the gap still matters in writing. Describe the AB0138241C1P1 in words a buyer can act on, and do not let a template carry the AB0158101A1A1's language onto it.
One needs sizing, the other needs stock
The AB0158101A1A1 comes on a bracelet and the AB0138241C1P1 on a strap. They are different jobs at resale: a bracelet has to be sized and its removed links kept with the watch, because a buyer who receives it short of links has received an incomplete watch. A strap is a consumable — check whether the one on the wrist is the one that should be in the photographs.
What to check on each
AB0138241C1P1
- Tell the buyer the water resistance is 3 bars before the watch ships. That is 30 metres with a crown that does not screw down, and a buyer who assumes a chronograph is a swimming watch will find out at your expense.
- Turn the slide rule bezel through a full revolution and check it moves freely in both directions without slipping. It is bidirectional by design here, and a computation bezel that binds has lost its function.
- Run the chronograph for a full twelve hours and read all three registers. This calibre records quarter seconds, 30 minutes and 12 hours, so a shorter test only exercises part of the mechanism.
AB0158101A1A1
- Check the bracelet taper against the published 20/20 mm figure. This reference does not narrow toward the clasp, which is unusual and changes which aftermarket straps will fit.
- Confirm the bezel ratchets one way only and holds firmly. A chronograph with a dive-style bezel invites the buyer to use it as one, so it needs to behave like one.
- Test the chronograph under load for twelve full hours. The 12-hour totaliser is the register nobody exercises and the one a tired movement struggles with.
Sources
- Breitling official product page for reference AB0138241C1P1 (Navitimer B01 Chronograph 43) - Caliber: Breitling 01 (Manufacture); Movement: self-winding mechanical; Power reserve: approx. 70 hrs; Chronograph: 1/4th second, 30 minutes, 12 hours; Vibration: 28,800 v.p.h; Jewel: 47 jewels; Calendar: dial aperture; Case material: stainless steel; Caseback: screwed in (sapphire crystal); Water resistance: 3 bars (30 m / 99 ft); Bezel: bidirectional, slide rule; Crown: non screw-locked, two gaskets; Crystal: cambered sapphire, glareproofed both sides; Diameter: 43 mm; Thickness: 13.69 mm; Lug width (in-between lug): 22 mm; Strap material: alligator leather; Strap color: black; Strap type: straight; Lug: 22/18 mm; Buckle material: stainless steel; Buckle type: folding clasp; Buckle size: 18 mm; page meta description states an ice blue dial — retrieved 2026-09-22
- Breitling official product page for reference AB0158101A1A1 (Chronomat B01 Chronograph 42) - Caliber: Breitling 01 (Manufacture); Movement: self-winding mechanical; Power reserve: approx. 70 hrs; Chronograph: 1/4th second, 30 minutes, 12 hours; Vibration: 28,800 v.p.h; Jewel: 47 jewels; Calendar: dial aperture; Case material: stainless steel; Caseback: screwed in (sapphire crystal); Water resistance: 20 bars (200 m / 660 ft); Bezel: unidirectional, ratcheted; Crown: screw-locked, two gaskets; Crystal: sapphire; Diameter: 42 mm; Thickness: 13.77 mm; Lug width (in-between lug): 20.05 mm; Strap material: stainless steel; Strap color: metal bracelet; Strap type: straight; Lug: 20/20 mm; page meta description states a white dial — retrieved 2026-09-22
Not affiliated with Breitling. Specifications are read from each manufacturer's own published documentation on the dates shown and may change; the manufacturer's current documentation governs.