Short answer
Omega does not sell a watch called the Hippocampus. Hippocampus is the seahorse emblem on Seamaster casebacks, in use since the 1950s. A search for "replica hippocampus 2023" points to counterfeit Seamaster models from the 2023 line, most often the Seamaster Diver 300M. Sellers use the word to describe the caseback engraving. The word is not a model name, a reference number, or a caliber name.
Why 2023 shows up in the keyword
Omega marked the Seamaster's 75th anniversary in 2023 with the Summer Blue collection. The release covered the Diver 300M, the Planet Ocean, the Aqua Terra, the Seamaster 300, and the Ploprof. Replica sellers picked up the term and attached it to their own listings. Reference numbers on those listings often do not match anything Omega published.
How a replica Seamaster differs from the real watch
- Movement. Genuine Diver 300M watches run an Omega Master Chronometer co-axial caliber. Replicas run a Seiko NH35, a Miyota, or a Chinese copy of an ETA 2824 with a printed rotor.
- Crystal. Genuine watches use sapphire with inner anti-reflective coating. Replicas range from mineral glass to sapphire with weak or no coating.
- Water resistance. Genuine Diver 300M is rated to 300 m. Replicas are not pressure tested to that figure. Gaskets, crowns, and caseback threads vary by factory. Many fail a 50 m test.
- Case and bracelet. Both use 316L stainless steel in most cases. Replica bracelets weigh less and show rough edges at the clasp and end links.
- Bezel. Genuine uses a ceramic insert with enamel or liquidmetal fill. Replicas use ceramic or aluminum, and the pip alignment is off on many units.
- Serial and warranty. Genuine watches ship with a Pictograms card, a Master Chronometer card, and a serial in the Omega database. Replicas ship with printed cards that do not resolve.
Prices in 2023
US retail for a Seamaster Diver 300M sat near $6,000 in 2023. Summer Blue references listed higher. Counterfeit versions sold from about $80 to $500, split into tiers that sellers label "AA," "AAA," and "1:1." Those labels are marketing terms. No factory discloses output, movement source, or reject rates.
Legal status in the United States
Trafficking in counterfeit goods is a federal crime under 18 U.S.C. § 2320. A first offense carries up to 10 years in prison and a $2,000,000 fine for an individual. U.S. Customs and Border Protection seizes counterfeit watches at the border. The personal-use exemption for one trademarked item does not cover counterfeits. Buying is not the same charge as selling, but the goods remain subject to seizure and forfeiture.
What is not known
No public data covers replica production numbers, factory names, or failure rates. Sellers who claim Swiss parts inside a sub-$500 watch do not provide documentation. Treat any specific durability claim as unverified.