What is the Constellation Master Chronometer 151?
There is no Omega watch called the Constellation Master Chronometer 151. Omega prints an eight-digit reference number on every Constellation Master Chronometer, such as 131.10.39.20.01.001, and "151" is a three-digit code used by replica sellers for their own stock lists. A watch advertised under that name is a counterfeit of an Omega design.
The Constellation Master Chronometer itself is real. Omega added the Constellation to its Master Chronometer program after starting METAS certification in 2015, and the line includes steel, two-tone and solid gold versions.
The difference matters the moment money changes hands. A genuine watch arrives with documentation tied to its movement serial, and a copy cannot produce that paperwork at any price.
Why the "151" name points to a replica
Omega reference numbers use eight digits split into dot-separated blocks. Those blocks describe the collection, the case material, the bracelet, the case size, the movement, the dial and the version.
A short tag like 151 does not fit that structure. It never appears on an Omega warranty card, a METAS certificate or a service record, and it does not resolve to a single watch.
The same number also gets reused across listings with different dial colors and case metals. Omega assigns a separate reference to each combination, so one code cannot cover a dozen variations.
What the genuine Constellation Master Chronometer looks like
The modern steel model uses a 39mm case, a Co-Axial Master Chronometer movement, roughly 55 hours of power reserve and water resistance rated to 150 meters. A sapphire caseback shows the movement.
The bezel carries engraved Roman numerals, and the dial has applied indexes with lume plots. Claws at the 3 and 9 o'clock positions mark the case sides, a design detail the line has kept for decades.
Retail prices sit in the thousands of dollars, with gold versions costing more. Any offer far below that range tells you what you are looking at.
How to verify a Constellation Master Chronometer: five checks
- Read the reference number. Look for eight digits in dot-separated blocks on the caseback and on the warranty card. The two must match, and the number should point to one dial color and one case size.
- Ask for the METAS certificate. A Master Chronometer is certified against its movement serial. A seller who cannot show that record is selling a fake.
- Look through the caseback. Real Constellations have a sapphire display back, a decorated rotor, Geneva stripes on the bridges and a free-sprung balance.
- Weigh it in your hand. Steel cases and solid bracelets have a heft that plated brass and hollow end links do not.
- Inspect the small type. The "Master Chronometer" text, the date wheel font and the crown logo are sharp and level on the real thing. Copies blur or misalign them.
What Master Chronometer certification covers
METAS tests the finished watch, not just the loose movement. Eight tests run across several days, and the results are recorded against the serial number.
- Average daily rate between 0 and +5 seconds, measured in six positions over eight days.
- Rate checked at full power reserve and again at low power reserve.
- Function of the winding and time-setting mechanisms.
- Rate measured while the watch sits in a 15,000 gauss magnetic field.
- Water resistance of the assembled watch.
- Accuracy after magnetic exposure, held to the same 0 to +5 window.
Most replica movements use a conventional balance spring that reacts to magnetic fields. They also lose time as the mainspring unwinds, which is the opposite of what the certification requires.
Details that counterfeits get wrong
- Caseback engraving. Real engravings are cut with deep, crisp walls. Fakes show shallow letters with rounded edges.
- Movement finish. Real rotors carry a correct logo and a striped finish. Copies use thin plating that wears through within months.
- Bracelet fit. End links sit flush against the case on a real Constellation. Fakes leave gaps and the bracelet rattles.
- Dial print. Text is thin and level. Counterfeit print is thick or sits off center above the indexes.
- Packaging. Box, cards and hang tag match the reference number on a real watch. Fake sets mix parts from unrelated models.
What to do if you bought a fake
Stop wearing it, photograph every part of the watch and packaging, then open a dispute with the marketplace or your payment provider. Credit card chargebacks have filing deadlines, so move inside that window.
Do not resell it. Selling a counterfeit watch is illegal in the United States and across most of Europe, even when you were the buyer who got cheated.
Report the listing to the brand's anti-counterfeiting team and to your national consumer protection office. Those reports are what get the next listing taken down.
FAQ
Does a Constellation Master Chronometer 151 exist?
No. Omega has never sold a Constellation with a three-digit model code. The 151 tag comes from replica sellers who number their own inventory.
How much does a genuine Constellation Master Chronometer cost?
Steel models start in the low thousands of dollars at retail and gold models climb from there. A price that looks too low for the metal and the condition is a warning, not a deal.
How do I check a reference number before buying?
Type the full eight-digit reference into a search engine and compare the photos that come back against the watch in front of you. Dial color, case size and bracelet should line up.
Can a replica pass METAS testing?
No. METAS records each certification against a movement serial, and Omega can confirm that record. A copy has no entry and cannot create one.