Short answer first
Omega reference 151.10.45.50.01.001 belongs to the Constellation line, and the string itself is a catalog code, not a nickname. Sellers of replica Constellation watches paste that exact code into titles because it makes a listing look documented. It doesn't. A reference number tells you which watch Omega built. It says nothing about the watch in the photograph.
So the useful question is not "which replica matches this reference." It is "what does this reference describe, and can the watch in front of me be checked against it."
How Omega reference numbers work
Omega builds references from dot-separated groups. Each group carries a piece of information: case family and material, case size, movement, dial, and a final variant number. You see the same skeleton on a Seamaster, a Speedmaster, or a Constellation, which is why the pattern feels familiar across the catalog.
The trap is assuming you can decode it yourself. Group meanings shift between generations, and older references follow older rules. If a listing's description conflicts with what Omega publishes for that reference, trust Omega.
What the Constellation line is known for
- The star and observatory medallion, traditionally on the caseback
- "Claws" at the 3 and 9 positions on many vintage and modern references
- Integrated or semi-integrated bracelets with polished center links
- Co-Axial movements and, on current production, Master Chronometer certification
Those four details are also where replica makers slip. The claws are often the wrong shape or too thin. The star medallion gets stamped instead of applied. Bracelet end links don't sit flush against the case.
Why this reference keeps showing up in replica listings
Long reference numbers look like proof. A buyer sees 151.10.45.50.01.001 and assumes the seller knows the product. In practice the number is copied from a genuine listing or from another replica listing, then reused across dozens of sellers who may all be shipping the same watch from the same workshop.
Search that reference and count how many "Swiss made" claims you find attached to different photos. The number is a costume, not a spec sheet.
What to check on any Constellation copy
- Dial printing. Look at the star, the word Constellation, and the OMEGA signature. Genuine dials stay crisp at macro distance; copies blur or sit unevenly.
- Date window. Edges should be clean and the date centered. An off-center date is one of the most common tells.
- Case finishing. Brushed and polished surfaces should meet on a sharp line. Rounded transitions mean a cheap case.
- Bracelet fit. End links flush, no rattle, no gap where the bracelet meets the lugs.
- Movement. Ask for a photo of the movement and a timegrapher reading. Established sellers send both. Sellers who won't are a bigger risk than the watch.
- Weight and feel. Steel density is hard to fake on a budget. A watch that feels hollow is hollow.
Authentication beats shopping
If the goal is a Constellation you can wear without doubt, the honest path is a pre-owned genuine example from a dealer who will open the caseback with you. Replica Constellation watches at this reference level are rarely the bargain they appear to be, because the parts that fail first, the movement, the crown, the clasp, are the parts you cannot inspect in a photo.
Bottom line
151.10.45.50.01.001 identifies an Omega Constellation. A replica listing that borrows the number is borrowing credibility from a watch it is not. Use the reference to check the real watch, use the checklist to judge the copy, and treat any seller who won't answer specific questions as the answer.