The Shortlist, Ranked by Wrist Time
The Fifty Fathoms chronograph is a hard watch to copy well. The dial printing is not the problem. The case is. Blancpain builds a flyback column-wheel chrono into a case that stays thin for a 300m diver, and that thinness is where cheap builds fall apart. So I judge these on three things: case thickness, pusher feel, and whether the bezel insert lines up with the dial markers at 12.
My Pick: 43.6mm Bathyscaphe-Style Chrono in Brushed Steel
If I were buying one today, this is the one. It tracks the reference 5200 proportions closely, so it sits on the wrist the way the real watch does. Most batches land between 13.5mm and 14mm thick and take a 23mm strap at the lugs. The bezel action is the tell: on the good ones it steps cleanly with no back-play, and the insert is ceramic, not painted aluminum.
Two caveats. The subdials on most batches sit a touch closer to center than the genuine, and the date font is chunkier than it should be. Neither is visible from a foot away. Also, treat the flyback as decoration. Pressing reset while the chrono runs will not snap back cleanly on a replica, so run it like a normal chronograph and it will behave.
Three Other Options Worth a Look
1. The 45mm Classic Case With Sapphire Bezel
- Bigger wrist presence, closer to the original military-diver look
- Thicker case, so it wears heavier than the Bathyscaphe version
- Best pick if your wrist is 7.25 inches or larger
- Watch for: bezel pip alignment and lume color matching the hands
2. Black Ceramic Bathyscaphe Chrono
- All-ceramic case and bezel, which changes the weight in a good way
- Scratches far less than steel in daily wear
- Watch for: sharp case edges and a matte finish that looks chalky
- Skip it if you want the brushed-steel look, since ceramic reads dressier
3. Entry Steel Build on Sailcloth
- Cheapest path into the look, and the strap is usually decent
- Based on a 7750 layout, so subdial spacing is the weak point
- Chrono pushers feel soft and the rotor is noisy
- Fine as a first dive chrono, not as a keeper
What I Check Before Paying
- Crown threads. Gritty threads are the fastest way to kill a diver.
- Bezel click count and back-play by hand.
- Subdial hand alignment at zero, all three registers.
- Lume charge and fade, compared across dial and bezel pip.
- Caseback engraving depth, which is usually shallow on budget batches.
- Strap width at lugs, because 23mm sailcloth is not easy to source.
Strap and Sizing Notes
These wear larger than the numbers suggest. A 43.6mm case with a 50mm lug-to-lug fits a 7-inch wrist without overhang, but the 45mm version starts to float on anything under 6.75 inches. Sailcloth and tropic rubber both suit the watch. A bracelet adds heft and makes the thickness obvious, which cuts both ways.
Bottom Line
Take the 43.6mm steel Bathyscaphe-style chrono if you want one watch that covers the reference properly. Go 45mm for wrist presence, ceramic for scratch resistance, and the entry build only if you want the silhouette on a budget. Everything else in this category is a variation on those three, usually with worse finishing.