Breitling · Superocean and Superocean Heritage

Breitling A17375211B1S1 vs Breitling U10340161C1A1

13 published specifications differ between these two, and 5 are identical. Every figure below is what the manufacturer states for that reference; nothing is inferred from the other watch.

What differs

Specification	Breitling Superocean Automatic 42, black dial, rubber strapA17375211B1S1	Breitling Superocean Heritage '57 Highlands, steel and 18k red gold, blue dialU10340161C1A1
Case	Stainless steel, 42 mm	Stainless steel and 18k red gold, 38 mm
Diameter	42 mm	38 mm
Thickness	12.56 mm	9.35 mm
Lug width	22 mm	18 mm
Water resistance	30 bars (300 m / 990 ft)	10 bars (100 m / 330 ft)
Bezel	Unidirectional, ratcheted	Bidirectional ratcheted
Dial	Black, as stated in the page description	Blue, as stated in the page description
Crown	Screw-locked, two gaskets	Non screw-locked, two gaskets
Bracelet	Rubber strap, black, straight, 22/18 mm	Stainless steel bracelet, curved, 18/16 mm
Clasp	Stainless steel folding clasp, 18 mm	Stainless steel folding clasp, 16 mm
Calibre	Breitling 17	Breitling 10
Power reserve	Approximately 38 hours	Approximately 42 hours
Jewels	26	25

What is identical

Worth knowing as much as the differences: these are the specifications you cannot use to tell the two apart.

Crystal: Cambered sapphire, glareproofed both sides
Case back: Screwed in
Movement: Self-winding mechanical
Frequency: 28,800 v.p.h
Movement notes: No chronograph or calendar complication is listed for this reference.

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.

These reach different buyers

42 mm on the A17375211B1S1 against 38 mm on the U10340161C1A1. Diameter is a poor predictor of how a watch actually sits, but it is the field buyers filter on, so the two land in front of different people. Do not let one listing's photographs or copy stand in for the other.

A visible difference in how they wear

3.2 mm of thickness separates these, with the A17375211B1S1 the taller at 12.6 mm. That is the difference between a watch that goes under a cuff and one that catches on it — worth a photograph from the side rather than a number in a table.

Do not describe these the same way

300 metres on the A17375211B1S1 against 100 on the U10340161C1A1 — not a variation on the same watch but a different class of one, built around a case and crystal designed for depth. Expect different buyers, different questions, and a different service conversation. Never carry the A17375211B1S1's rating into the U10340161C1A1's listing.

One of these is a different asset to hold

The U10340161C1A1 has a gold case and the A17375211B1S1 is steel. That is not just a price difference: a precious-metal case changes what your insurer needs told, how the piece should be stored and handled, and — in some jurisdictions — whether trading it puts you under a precious-metals rule your steel stock would not. Check your own city guide before you assume they are the same transaction.

One needs sizing, the other needs stock

The U10340161C1A1 comes on a bracelet and the A17375211B1S1 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

A17375211B1S1

Count the bezel clicks through a full turn and confirm it will not move clockwise at all. A dive bezel that can run backwards can understate elapsed time, which is the one failure mode the unidirectional design exists to prevent.
Seat and unseat the screw-locked crown several times, feeling for the thread catching cleanly. At 300 metres the crown is a primary seal and a cross-threaded one is an expensive tube repair.
Expect this to stop overnight if it is left off the wrist. Thirty-eight hours sits at the bottom of the range covered on this site, and a buyer used to a 70-hour movement will think the watch is faulty.

U10340161C1A1

Read the crown specification before you describe this as a dive watch. It is a Superocean rated to 100 metres with a crown that does not screw down, which is not the same proposition as the 300-metre references in the same family.
Check where the red gold is and where the steel is, then judge wear separately on each. Gold is softer, marks more readily and cannot be refinished as freely, so a two-metal case wears unevenly by nature.
Confirm the bezel turns both ways. It is specified as bidirectional here, unlike the unidirectional bezels on the dive-rated Superoceans, and a stiff one is a fault rather than a safety catch.

Sources

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.