"Replica hippocampus 2017" refers to counterfeit copies of Omega Seamaster watches that reproduce the hippocampus, or seahorse, emblem engraved on the caseback, with the 2017 generation used as the reference point. The phrase names a class of copy, not an Omega model. Omega has never sold a watch called a Hippocampus, and the seahorse appears on genuine watches only as a caseback engraving that marks the Seamaster family.
What the emblem marks, and what it does not
Omega has used the hippocampus on Seamaster casebacks since the 1950s. It signals family membership and nothing more. A 2017 Seamaster Aqua Terra, a Planet Ocean, and a Diver 300M all carry the emblem, so a listing that leads with "hippocampus" instead of a reference number is telling you the seller either does not know the model or does not want you to check it.
Why 2017 appears in the search term
2017 was a design break for the Aqua Terra. The Master Chronometer version moved the date from 3 o'clock to 6 o'clock, removed the date frame, added "Master Chronometer" dial text, and switched to METAS-certified 8900 and 8800 movements. Planet Ocean references from the same year added Master Chronometer movements in 39.5 mm and 43.5 mm cases. Copies tagged "2017" usually claim one of these updated layouts, so a watch sold as a 2017 Aqua Terra with a date at 3 o'clock contradicts its own label.
Prerequisites
- 10x loupe or a macro lens
- Timing machine, or a phone app that reads beat rate
- Calipers
- Macro photos of the genuine reference for comparison
- Pressure tester, if water resistance matters to you
How to check a watch sold as a 2017 hippocampus copy
- Pin down the reference number first. Ask the seller for the five-digit case reference and the movement caliber, then compare both against Omega's own catalog.
- Inspect the caseback engraving under the loupe. Genuine hippocampi are struck with clean edges and a visible tail curl; copies show shallow, rounded lines and a flat body.
- Time the movement. The 8900 and 8800 run at 25,200 vibrations per hour with roughly 55 to 60 hours of reserve; a copy running at 21,600 with a 38-hour reserve is a different engine.
- Work the crown and, on a Planet Ocean, the helium escape valve. Genuine threads engage smoothly and the valve seats flush.
- Measure the case with calipers. Published dimensions are tight to a few tenths of a millimeter, and copies usually run thick.
- Compare dial print and date placement against reference photos at the same angle. Check the date font, the alignment inside the window, and the letter spacing of the dial text.
- Test water resistance on a pressure tester, never in a sink. Skip this step if the watch has not been serviced.
- Have an authorized watchmaker or an Omega service center open the case. Movement finish, rotor engraving, and the balance assembly settle the question in minutes.
Flaws that appear most often
- Shallow laser-etched seahorse instead of a struck engraving
- Case weight and thickness off by more than a gram or a tenth of a millimeter
- Date window framed or placed at 3 o'clock on a watch labeled as 2017
- Lume that glows green where the genuine reference glows blue
- Bracelet end links that sit proud of the lugs
- Rotor engraving in the wrong typeface or the wrong depth
Legal position in the United States
Counterfeit watches are illegal to sell or traffic in the US, and U.S. Customs and Border Protection can seize shipments at the border. Buying one abroad does not make the transaction lawful, and reselling it exposes you to civil liability from the trademark owner. If your goal is a Seamaster look on a budget, a legitimate alternative exists in used or gray-market genuine watches and in homages that carry their own branding.