The strongest replica of a 2017 Omega Seamaster, the watch collectors call the Hippocampus, is the Aqua Terra 150M built on a decorated clone of the 8900 movement. That pick comes down to four checks: case and lug geometry that matches the genuine 41mm profile, a dial and crystal that survive a loupe, a movement that keeps time and can be serviced, and a bracelet and clasp that stay quiet. Everything below sorts the 2017 Seamaster family by those four tests.
What Hippocampus 2017 Means in the Replica Market
Hippocampus is the seahorse engraved on Seamaster casebacks, and collectors in Chinese-speaking markets use the word for the whole Seamaster line. A 2017 build points at a specific group of references: the Aqua Terra 150M Master Chronometer with the horizontal teak dial, the Planet Ocean 600M in 43.5mm, the Deep Black GMT, and the last wave-dial Seamaster Diver 300M before the 2018 redesign. Each reference has its own replica ecosystem, and quality varies more between references than between sellers. A copy is still a copy: it has no resale value as an Omega and should never be presented as genuine.
Criterion 1: Case and Bezel Geometry
Case shape separates a wearable copy from a prop. The 2017 Aqua Terra uses a slim twisted-lug case with a flatter profile than the earlier 8500 generation. The Planet Ocean carries a 43.5mm case with a thick chamfered flank and a tall sapphire back. Copies that drop either watch into a generic 42mm case are easy to spot in the hand.
Pros
- Correct lug curve and crown guards make the watch sit properly on the wrist.
- A ceramic or Liquidmetal bezel insert with a flush pip reads close to the original at arm's length.
- Caseback engraving with the seahorse and reference text adds credibility on the desk.
Cons
- Thick cases with sharp lug tips catch on shirt cuffs.
- Printed bezel inserts fade or scratch, while genuine ceramic does not.
- Misaligned bezel pips at 12 are the most common fault on cheaper builds.
Criterion 2: Movement Choice
Three movement families show up in 2017 Seamaster copies. The Asian 2824 and Miyota 8215 are workhorses that any watchmaker can regulate and service. Decorated clone 8500 and 8900 movements add a correct open caseback look and a smoother sweep, but parts are harder to source. Quartz versions exist and are cheap, though the ticking seconds hand gives them away at once.
Pros
- 2824-based builds run for years and cost little to repair.
- Clone 8500 and 8900 movements display a rotor and bridges that resemble the genuine article through the back.
Cons
- Decorated clones often arrive dry and need immediate regulation.
- Quartz versions lose the sweeping seconds hand that defines a mechanical Seamaster.
Criterion 3: Dial, Hands, and Crystal
The 2017 Aqua Terra teak dial, the Planet Ocean ceramic dial, and the wave dial on the 300M each have a texture that cheap printing cannot fake. Look at date window framing, applied indices, and the lume plots on the hands.
Pros
- Sapphire crystal with inner anti-reflective coating kills most glare.
- Applied indices with proper bevels catch light the way the genuine dial does.
Cons
- Flat printed dials look correct in photos and flat in person.
- Mineral glass scratches within months and shows a blue tint.
- Arrow hands on the Planet Ocean are frequently too wide or too short.
Criterion 4: Bracelet, Clasp, and Water Resistance
A Seamaster lives on a bracelet, so link fit matters. The 2017 Aqua Terra bracelet tapers and uses a butterfly clasp, while the Planet Ocean uses a diver extension. Treat any replica as splash resistant only. Gaskets and case finishing on copies rarely support the depth rating printed on the dial.
Pros
- Solid end links that sit flush against the case hide the gap that ruins most copies.
- A correctly engraved clasp with the seahorse is a small but visible detail.
Cons
- Hollow end links rattle and pull arm hair.
- Swimming or showering in a copy risks water in the movement.
Top Pick: 2017 Aqua Terra 150M Replica
The Aqua Terra is the best all-round 2017 Hippocampus copy because its slim case, teak dial, and simple three-hand layout give a factory fewer places to fail.
Pros
- Dressy enough for the office, casual enough for jeans.
- Slim case slips under a cuff, unlike the Planet Ocean.
- Simpler dial means fewer alignment faults out of the box.
Cons
- Less visual drama than a dive bezel model.
- The teak texture is the hardest dial detail to copy well.
Use case: daily wear for someone who wants one watch that works at a desk and at dinner.
Runner-Up: Planet Ocean 600M 43.5mm Replica
If you want the presence of a dive watch, the 2017 Planet Ocean is the pick. It wears large, so a 7 inch wrist is the practical floor.
Pros
- Ceramic bezel and bold dial read clearly across a room.
- Strong wrist presence for the money.
Cons
- Thick case and 43.5mm width overwhelm small wrists.
- Heavier, so bracelet stretch shows up sooner.
Use case: weekend and travel wear where a chunky dive watch is the point.
Budget Pick: Wave-Dial Seamaster Diver 300M Style
The pre-2018 300M shape remains the cheapest way into the Hippocampus look, with the helium valve at 10 and the wave dial.
Pros
- Lowest entry point and the most common build on the market.
- Recognizable silhouette with the scalloped bezel.
Cons
- Wave dials on cheap copies look printed rather than molded.
- Bezel action is often loose or gritty.
Use case: a first copy for someone testing whether they enjoy the Seamaster shape.
How to Check Before You Buy
- Ask for macro photos of the dial, crown, and caseback engraving in daylight.
- Request a photo of the movement with the caseback open.
- Confirm the bezel pip aligns with 12 and the date snaps cleanly.
- Ask whether the bracelet has solid end links and a signed clasp.
- Check the seller's return window and whether they service movements before shipping.
Sort the 2017 lineup this way and the Aqua Terra remains the safest buy, with the Planet Ocean as the choice for anyone who wants a dive watch on the wrist.