A replica Fifty Fathoms in white gold is a third-party copy of Blancpain's 45mm dive watch, and almost all of them are stainless steel with a rhodium or white gold plating rather than solid 18K gold. A small number of high-end builders do offer solid white gold cases, and those cost several thousand dollars because the metal itself carries the price. The genuine watch they copy is the Fifty Fathoms Automatique in 18K white gold: 45mm case, sapphire bezel insert, in-house caliber 1315, 120-hour power reserve, 300m water resistance.
What the Genuine Reference Uses
Blancpain's white gold Fifty Fathoms sits at the top of the line. The case is 18K white gold, which is gold alloyed with palladium or nickel and then rhodium plated at the factory to reach a bright silver tone. The bezel insert is sapphire, not ceramic or aluminum, and it is domed. The movement is the caliber 1315, a three-barrel automatic with a silicon balance spring and roughly five days of run time. The caseback is sapphire, and the strap options are sailcloth, rubber, or an 18K white gold bracelet.
How Replica Builds Differ
Plated steel builds
This is the common category. A 316L or 904L steel case gets a rhodium or palladium plating, usually 3 to 10 microns thick. It looks correct on the wrist and weighs close to the real thing because the case dimensions match. The plating will wear through at the crown guards, lugs, and caseback edges with daily use, exposing steel underneath.
Solid white gold builds
A few factories machine cases from actual 18K white gold. These are rare, heavy, and priced like jewelry. Ask for an assay or a density test before paying, because sellers mislabel gold-plated steel as solid gold on a regular basis.
What to Inspect Before You Buy
- Ask the seller for the case metal and the plating thickness in microns, in writing.
- Weigh the watch on a kitchen scale and compare it to the published weight of the genuine reference.
- Measure the case diameter across the bezel and the lug-to-lug distance with calipers.
- Check the bezel insert material by tapping it and looking for the depth and gloss of sapphire.
- Rotate the bezel through a full turn and listen for even clicks with no back play.
- Inspect the dial text under a loupe for correct font weight, spacing, and alignment.
- Wind the crown and count the threads, since poor threading is the most common failure point.
- Charge the lume under a lamp and check the glow color and duration against photos of the genuine dial.
- Open the caseback or ask for movement photos to confirm which caliber is installed.
Wear and Care Reality Check
Treat any replica as splash resistant at best. Gaskets on copies are not tested to the same standard, so keep it out of pools, showers, and salt water even if the caseback says 300m. Wipe the case with a soft cloth after wear, and keep plated surfaces away from abrasive cleaners, since polishing compound removes plating fast. Store the watch on a pillow rather than flat, which reduces pressure on the crown.
Questions to Ask the Seller
- Which factory produced this batch, and what is the version number?
- Is the plating rhodium, palladium, or white gold, and how thick is it?
- Which movement is inside, and is it a decorated clone or a Swiss sellita or ETA base?
- What is the return window, and does it cover plating defects?
- Can you send timestamped photos of the actual unit, not stock images?
Legal and Ethical Note
White gold Fifty Fathoms replicas carry Blancpain trademarks on the dial, caseback, and clasp. Selling or importing them as genuine goods is counterfeiting, and customs agencies seize shipments on that basis. Buy and wear them as what they are, and never resell one as an authentic watch.