Breitling Navitimer B01 43 AB0138241C1P1: specs and what to check

Three bars, and everyone assumes more

Start here, because this is the specification that generates complaints.

Breitling states the water resistance of this reference as 3 bars — 30 metres, 99 feet — and the crown as non screw-locked.

Thirty metres is a rating for rain and hand-washing. It is not a swimming rating, it is not a shower rating, and there is no screw-down crown standing between the movement and a wet sleeve.

Buyers do not expect this. A Navitimer looks like a pilot's instrument, it is large, it is a chronograph, and every one of those cues suggests toughness. The number says otherwise.

Put "30 m water resistance, non screw-down crown" in the listing in plain text, not buried in a spec dump. It is one line, and it is the difference between a satisfied buyer and an argument about a watch that fogged in the shower.

A bezel that calculates

The bezel is bidirectional and carries a slide rule — a circular logarithmic scale that pairs with the printed ring on the dial to do multiplication, division, fuel burn and unit conversion.

Two things follow for inspection.

It must turn both ways, freely. Unlike a dive bezel, there is no safety reason to restrict direction here, and a bezel that has stiffened with age or grit cannot be lined up against the inner scale.

It must not slip. A computation bezel is only useful if it stays exactly where you set it. Align a mark, let go, and give the watch a light shake.

Spin it through a full revolution listening for grit and feeling for tight spots. This is a working instrument, not a decorative ring, and a buyer who bought a Navitimer for the slide rule will notice.

Exercise all three registers, for the full duration

The Breitling 01 is the manufacture chronograph calibre: 28,800 v.p.h, 47 jewels, approximately 70 hours of reserve, and a chronograph reading quarter seconds, 30 minutes and 12 hours.

The twelve-hour totaliser is the part most inspections skip, because testing it properly means leaving the chronograph running for half a day.

Do it anyway. Start it, leave it, and come back. You are checking three things at once: that the hour totaliser advances at all, that the minute counter jumps cleanly rather than creeping, and that the movement holds up under the load of a running chronograph — which is precisely when a tired one gives up.

While it runs, look through the screwed-in sapphire case back. You want to see clean bridges, no oil creeping from the jewels, and a rotor turning without touching anything.

Dimensions for the listing

43 mm across, 13.69 mm thick, 22 mm between the lugs, on an alligator strap tapering 22/18 mm to an 18 mm stainless steel folding clasp.

Breitling does not publish a lug-to-lug figure for this reference, so if the buyer asks, measure it yourself and say that you measured it. Do not guess and do not repeat a number from a forum.

The crystal is cambered sapphire, glareproofed on both sides. As always, the inner coating is the one you cannot reach — check for interior haze at a low angle before you describe the watch as clean.