The Fifty Fathoms Bathyscaphe 5200 is Blancpain's modern dive watch family, built around a roughly 43 mm case, 300 m of water resistance, and an in-house automatic movement. It carries the 1950s Bathyscaphe styling into current production: a clean dial, large luminous markers, a ceramic bezel, and a case that works with a suit as well as a wetsuit. The numbers in the reference identify the case, movement and material combination, so 5200 points you to a specific branch of the Bathyscaphe line rather than a single watch.
What the reference number tells you
Blancpain references are built as a code. The first block identifies the model family, the middle block identifies the case material and finish, and the final block identifies the dial and strap fitted at the factory. That is why two watches that look almost identical on a dealer's tray can carry different numbers: steel versus ceramic, bracelet versus sail cloth, black dial versus blue.
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For the Bathyscaphe 5200 range this matters when you compare listings. A seller who quotes only the family number is not giving you enough to price the watch, because the material alone can move the price by a wide margin.
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Specs at a glance
- Case size: about 43 mm for the main Bathyscaphe models, with a smaller 38 mm line for narrower wrists
- Water resistance: 300 m, with a screw-down crown and a screw-in case back
- Crystal: sapphire front and back, with anti-reflective treatment
- Bezel: unidirectional, ceramic insert with luminous markings
- Movement: in-house automatic, silicon balance spring, multi-day power reserve in the three-hand versions
- Strap options: sail cloth, NATO, leather, rubber, or a matching metal or ceramic bracelet
Why the Bathyscaphe and the classic Fifty Fathoms are different watches
The classic Fifty Fathoms is the larger, more military-looking tool watch. The Bathyscaphe is the civil version: thinner, dressier, with a simpler dial and a bezel that sits closer to the case. The original Bathyscaphe appeared in the mid 1950s as a smaller, easier to wear dive watch for people who were not professional divers.
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That history explains the modern design choices. The lugs curve down instead of out, the dial is uncluttered, and the hands stay readable in low light without looking tactical.
The movement
The three-hand Bathyscaphe uses an in-house automatic caliber with a silicon balance spring, which resists magnetism and temperature drift better than a traditional steel spring. The power reserve runs several days, so the watch can sit over a weekend and still be running on Monday.
The flyback chronograph version uses a higher beat caliber with a column wheel and a vertical clutch, which gives a cleaner start to the chronograph and lets the seconds hand run without the usual jump. Both movements are finished to a standard you can inspect through the sapphire case back.
What to check before you buy
- Match the full reference number to the case material, dial color and strap you actually want.
- Confirm bezel action: it should index with no back play and no grinding.
- Check the crown for cross threading, and confirm it screws down fully.
- Look at the case back engraving and the movement finish through the display back.
- Ask about service history if the watch is more than five years old.
Replica and copy versions
Many searches for a Fifty Fathoms Bathyscaphe 5200 copy start with photos of the real watch, so it helps to know what separates the two. A replica can reproduce the silhouette, the dial print and the overall proportions, but the parts that are hardest to copy are the ones you notice on the wrist: the sharpness of the case bevels, the fit of the bracelet end links, the color of the luminous material, and the feel of the bezel detents.
The movement is the bigger difference. A genuine Bathyscaphe runs an in-house caliber with a silicon balance spring and a multi-day reserve. Copy watches use third party or generic movements, which means different accuracy, a shorter reserve, and no factory parts support. Water resistance is also something you cannot assume on a copy, even when the case back is stamped with a depth rating. If you plan to swim or dive, that rating should come from a pressure test, not from the printing on the metal.
Sizing and daily wear
At roughly 43 mm the Bathyscaphe wears smaller than the number suggests, because the bezel is narrow and the lugs turn down. On a 17 cm wrist it is a full but comfortable watch. The 38 mm version is the safer pick for smaller wrists or for anyone who wants the look without the bulk.
Strap choice changes the character more than anything else. Sail cloth and rubber push it toward casual, a bracelet makes it read as a sports watch you can wear to the office, and leather softens it into a weekend piece.
Quick answer recap
The Fifty Fathoms Bathyscaphe 5200 is a 43 mm class Blancpain diver with 300 m water resistance, a ceramic bezel, and an in-house automatic movement. Buy it for the proportions and the dial, verify the full reference number before you pay, and treat any copy version as a different product with a different movement and no guaranteed water resistance.