Short answer
The phrase points to copies of one watch: the Omega Seamaster Planet Ocean 600M Co-Axial Chronograph, reference 212.10.44.51.01.001. Hippocampus is the seahorse. Omega stamps a seahorse medallion on the caseback of this line, and sellers of copies reuse both the name and the number. The reference comes from the generation before 2011, when Omega moved the Planet Ocean chronograph to the calibre 9300.
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Reading the reference number
Omega builds five-part reference numbers. Each block carries one fact.
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- 212: Seamaster case family
- 10: case and bracelet code
- 44: case size in millimetres
- 51: chronograph movement code
- 01: black dial
- 001: version
The full number appears on the certificate and on factory paperwork. Omega engraves the case number inside the caseback on most references. A watch with a different number inside the caseback than on the paperwork is a mismatch, not a variant.
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Genuine specs to compare
- Stainless steel case, coded 44 mm, measured across the bezel
- 600 m water resistance
- Helium escape valve at 10 o'clock
- Screw-down crown and screw-down chronograph pushers
- Unidirectional dive bezel with a 60-minute scale
- Sapphire crystal with anti-reflective coating on two sides
- Solid caseback with the seahorse medallion
- Automatic Co-Axial chronograph movement
- Steel bracelet with folding clasp and dive extension
Where copies differ
Movement. The genuine movement beats at 28,800 vibrations per hour, so the small running seconds hand sweeps. Quartz copies tick one step per second. Count the steps over 10 seconds: a quartz hand lands on 10 separate marks.
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Bezel. A genuine insert sits flush with the case and the pip lines up with 12 o'clock. Copies show a gap at the insert edge, a pip off centre, and thin print.
Caseback. The seahorse medallion is stamped into steel. Copies laser-etch a shallow outline that fades, and the text around it is thin.
Weight. A steel Planet Ocean chronograph on a full bracelet weighs more than 200 g. Copies built with hollow links and a thin case come in lighter.
Crown and pushers. Genuine pushers turn with resistance and seal. Copies cross-thread in two or three turns.
Dial and hands. The date window on the genuine is cut square. Copies show a bevelled or oversized window, and printed markers sit off centre.
Checks before you buy
- Ask for a photo of the movement with the caseback off, or a timegrapher reading.
- Match the number inside the caseback to the paperwork.
- Weigh the watch.
- Watch the seconds hand for 10 seconds.
- Line up the bezel pip with 12 o'clock.
Limits of any check
Photos hide weight, thread feel, and lume brightness. A high-grade copy with a decorated automatic movement can pass a photo check. The reference number proves nothing on its own, because any seller can print it on a card.