Answer
"Fake hippocampus" is a search phrase, not a model name. Omega sells no watch called the Hippocampus. Hippocampus is Latin for seahorse, and the seahorse is the emblem stamped on the caseback of the Omega Seamaster. A "fake hippocampus" means a Seamaster replica that copies that seahorse mark.
217.10.41.21.03.004 is a reference-number string in the Omega house format. The six groups run 217.10.41.21.03.004. Omega has used this six-part pattern since the 2000s. The third group, 41, points to a 41 mm case. The fifth group, 03, marks a blue dial on most Omega charts. The prefix 217 does not match a public Omega catalog family. Treat a listing that opens with 217 with caution.
How the number breaks down
- 217: case family or material code. Not confirmed in public Omega references.
- 10: bracelet or strap code. 10 is steel in common Omega tables.
- 41: case diameter, 41 mm.
- 21: movement family code.
- 03: dial color, blue.
- 004: sequence number inside the family.
The seahorse emblem
Omega placed the seahorse on Seamaster casebacks in 1956. The mark shows a seahorse with a curled tail. Genuine casebacks use a deep die-struck relief. The outline is sharp and the eye is cut. Replicas show a shallow stamp, soft edges, and a tail that does not curl to the body.
Replica tells
- Relief depth under 0.2 mm.
- Seahorse eye missing or filled with metal.
- Caseback digits in a font that differs from the dial text.
- Caseback threads that bind before the case closes flush.
- Engraving that sits on the case edge, not centered.
Measure the case first. A Seamaster reference with 41 as the third group measures 41 mm across the case, not counting the crown. A caliper reading of 39 mm or 43 mm points to a copy with a wrong reference string.
Legal note
Trademark law covers the Omega name and the seahorse device. U.S. Customs and Border Protection can seize goods that carry a counterfeit mark. Some listings that use the phrase "fake hippocampus" ship from sellers outside U.S. jurisdiction, which limits buyer remedies.