The top pick for a replica Fifty Fathoms Bathyscaphe 5200 is the 43.6 mm black ceramic version with a sapphire bezel insert and a working flyback chronograph. It wins on the four criteria that decide whether a 5200 replica reads correctly on the wrist: case dimensions and finish, bezel and dial layout, chronograph behavior, and strap hardware. Everything below hangs off those four tests.
What the 5200 reference actually is
Blancpain lists the Bathyscaphe Chronographe Flyback in the 5200 reference family with a 43.6 mm case, the in-house calibre F385, a flyback chronograph, and 300 m of water resistance. The dial carries applied rectangular indices, a wide handset, a date window set low on most variants, and a ceramic or sapphire bezel insert depending on the version. Those figures are the yardstick. A replica is judged by how close it sits to them, not by how sharp the listing photos look.
Criterion 1: Case size, material, and finish
Start with the case. The genuine article is a 43.6 mm dive case with alternating brushed and polished surfaces and a signed crown with guarded shoulders. Many replicas widen the case to 44 mm, thicken the lugs, or soften the crown guards to the point where the profile looks wrong from the side. Ask for a straight-on side photo and a wrist shot, then compare the lug-to-lug against the published spec sheet instead of trusting a listing angle.
- Pros: ceramic cases resist scratches and hold their polish well; a correct 43.6 mm profile wears closer to the genuine piece than a 44 mm copy; screw-down crowns that engage cleanly are a sign of better machining.
- Cons: ceramic replicas can chip at the lug edges if dropped, and a chip cannot be polished out; steel versions feel heavier than the genuine ceramic; coarse crown threads are common on cheaper builds.
Criterion 2: Bezel insert and dial layout
The bezel insert separates a good 5200 replica from a poor one. Genuine sapphire inserts have depth, sharp lume markers, and a pip that lines up with the 12 o'clock index. Replica inserts often use mineral glass or printed acrylic with a flat look, a drifting pip, or a turn that is too easy. On the dial, check that the indices are applied rather than painted, that the date font matches the reference, and that the text spacing near the Bathyscaphe name is even.
- Pros: a sapphire insert with real depth catches light the way the genuine bezel does; applied indices and a correct date wheel do most of the visual work at arm's length.
- Cons: mineral inserts scratch and cloud over time; a misaligned pip is visible from across a room; printed indices flatten the dial under indoor lighting.
Criterion 3: Chronograph and movement behavior
The genuine calibre F385 runs at a high beat rate with a vertical clutch and a true flyback, meaning one pusher press stops, resets, and restarts the chronograph. Most replicas use a modified Valjoux 7750 style movement or a Seagull chronograph base, neither of which offers a functional flyback. Test it before you buy: run the chronograph, reset it, and see whether it restarts from a single press or needs a stop and a separate reset. A 7750 based replica beats at a lower rate, so the sweep looks slower than the genuine piece.
- Pros: the 7750 platform is widely serviced and spare parts exist; pusher feel can be crisp on better builds; a working date quickset is convenient.
- Cons: no real flyback function; rotor noise is common; the thicker movement pushes the case height past genuine; subdial spacing at 3, 6, and 9 often looks compressed.
Criterion 4: Strap, clasp, and water resistance claims
Genuine 5200 variants ship on sailcloth, a NATO style strap, or a bracelet. Replica straps are usually the weakest part: stiff canvas, sharp buckle edges, and stitching that frays. Budget for a replacement strap. Ignore any water resistance rating printed on a replica, because nothing about that claim is tested or certified. Treat the watch as splash resistant at best.
- Pros: swapping to an aftermarket sailcloth or rubber strap closes most of the gap; a decent deployant clasp improves daily comfort.
- Cons: factory straps rarely match genuine texture; buckles scratch quickly; swimming or diving with a replica risks a flooded movement and a dead watch.
Black ceramic versus brushed steel
Pick ceramic if you want the closest match to the reference look and you accept that a hard knock can chip it. Pick brushed steel if you want something that survives daily abuse, hides scratches, and costs less to repair. For a dressier rotation, ceramic wins. For a single beater worn with everything, steel wins.
Who should buy one, and who should not
Buy a 5200 replica if you want the dive chronograph silhouette for casual wear, you understand it is not the genuine watch, and you never plan to present it as one. Skip it if you dive, if you want manufacturer service or a warranty, or if you expect resale value. Note that importing counterfeit goods into the United States is prohibited, and shipments can be seized by customs.
How to vet a seller
- Ask for a video showing the chronograph running, resetting, and the date flipping.
- Request a timegrapher reading and a clear photo of the caseback engraving.
- Confirm a return window in writing before paying.
- Walk away from anyone promising Swiss made parts or a 1:1 factory match to the genuine line, because neither claim holds up.