What "fake hippocampus 2013" refers to
The hippocampus is the seahorse emblem Omega stamps on Seamaster casebacks. It appeared on the 1957 Seamaster 300 and stayed on most Seamaster backs after that. "Fake hippocampus 2013" is a search phrase, not a model name. It points to counterfeit Seamaster casebacks traded or discussed around 2013, and to the question of how a fake seahorse stamp differs from a real one.
No Omega reference is called "Hippocampus." The word describes the engraving.
What changed around 2013
Omega moved the Seamaster line toward display casebacks in the mid-2010s. The 2013 to 2014 window covers the launch of the Master Co-Axial movements, rated to 15,000 gauss. Watches with solid casebacks, including Seamaster Diver 300M ref. 212.30.41.20.01.003, still carried the stamped hippocampus at that time. That mix explains the year in searches: buyers were comparing engraved backs against newer sapphire backs.
Details that separate a real stamp from a fake
- Depth. Genuine stamping cuts into the steel. Many fakes etch a shallow outline that catches light but has no floor.
- Seahorse tail. On genuine backs the tail curls tight and the fin lines stay separate. Fakes merge the lines into one shape.
- Trident. The three prongs are distinct and centered. Fake tridents can look like one spike or sit off center.
- Omega symbol. The omega mark has flat feet and even curve thickness. Fake marks run thin on one side or use a different font.
- Text. "Seamaster" and the reference number follow Omega's own spacing. Letters on fakes are rounder or wider.
- Caseback edge. Genuine backs have a crisp machined lip and correct thread pitch. Fakes can sit proud of the case.
Reference points for 2013
Seamaster Diver 300M references from that era include 212.30.41.20.01.003 (black dial, steel) and 222.30.42.20.01.001 (titanium). Caseback markings should match the reference on the warranty card and the movement inside. A hippocampus stamp does not prove a watch is real. A plain caseback does not prove it is fake.
What a photo cannot confirm
Movement, serial number, and service history carry more weight than any caseback photo. Counterfeiters copy the visible part and skip the rest. If the serial does not match Omega records, the caseback does not matter. An authorized service center is the reliable check.