The short answer: the best fake Villeret Ultra Thin is a 39 to 40 mm stainless steel build running a Miyota 9039 or a decorated Miyota 9015, with a case that stays under 10 mm thick and a dial that places the Roman numerals, leaf hands and small seconds where they belong. Skip quartz versions. Skip sellers who will not send QC photos of the exact watch before it ships. Three criteria decide the outcome: movement architecture, case and dial faithfulness, and whether the seller documents the specific piece you receive.

What a Villeret Ultra Thin Is Meant to Be

Blancpain's Villeret line is the brand's classic round dress watch family. The ultra thin references keep a plain stepped case, a polished bezel, slim lugs and a domed sapphire crystal, usually with small seconds at 6, applied Roman numerals and a thin leather strap on a pin buckle. Diameters run from roughly 38 to 40 mm and total thickness lands near 8 to 10 mm depending on the reference. Inside the genuine watch sits a hand finished in house automatic, visible through a sapphire caseback with beveled bridges, blued screws and a signed rotor. That caseback is where replicas expose themselves first, and it is also the part nobody sees while the watch is on your wrist.

Top Pick: Thin Automatic on a Miyota Base

This is the version worth buying. The movement is roughly 3.9 mm tall, so the case can genuinely sit near 9 to 10 mm instead of the 12 mm slab you get from a cheap automatic with a spacer ring. Small seconds versions add a conversion plate, so ask the seller for the thickness measurement before you commit.

Pros

  • Real slim profile that matches the dress watch proportions the model is known for.
  • Common parts, so any competent watchmaker can regulate or service it.
  • No date window on the cleanest dial options, which removes the most common dial tell.

Cons

  • Rotor noise is audible in a quiet room.
  • The movement finish under the caseback is industrial next to the real bridges.
  • Rate is often off out of the box and needs timing in the first weeks.

Use case: daily wear. On the wrist the silhouette does the work, and the caseback stays against your skin.

Mid Tier: Decorated Movement With a Display Back

Factories that build for the second hand and resale market add striped plates, a signed rotor and blued screws. The view through sapphire is closer to the genuine article, and the hands and indices are usually a step up as well.

Pros

  • Convincing view through the caseback for anyone you hand the watch to.
  • Better case finishing on the lugs and bezel edges.
  • Small seconds sub dial aligned with more care than budget builds.

Cons

  • The decoration plate adds thickness, and many of these builds push past 11 mm.
  • Decorated surfaces are cosmetic and do not move with the bridges underneath.
  • Higher price for a gain you only see when the watch is off your wrist.

Use case: collectors who photograph their watches, or anyone who regularly takes a watch off in company.

Budget Tier: Quartz and Photo Only Builds

These show up in the same search results as the automatics and often use the same photos. A quartz small seconds hand ticks once per second instead of sweeping, which is the first thing a watch person notices.

Pros

  • Low cost, and thin cases are easy to produce.
  • Accurate timekeeping with no winding and no rotor noise.
  • Fine as a costume piece where nobody inspects the dial.

Cons

  • Ticking sub dial hand.
  • Flat printed indices with no applied depth.
  • Plated cases that wear through to base metal at the lugs and crown.

Use case: stage, film or a single event. Not for anyone who handles watches up close.

Checks Before You Pay

  1. Ask for a caliper photo of total thickness at the case middle, not at the crystal dome.
  2. Compare the small seconds position, hand length and dial aperture against reference photography.
  3. Look for applied Roman numerals with polished edges and real depth, not flat ink.
  4. Check the crown size and any guilloche pattern. Undersized crowns are common.
  5. Confirm the lug width and how the strap meets the case without a gap.
  6. For a display back, study the rotor engraving and bridge shape, since that is the hardest part to copy well.
  7. Ask what the strap actually is. Alligator shipments need CITES paperwork, so most sellers ship stamped leather and call it alligator.
  8. Weigh the import risk. US customs can seize counterfeit goods, and that loss usually lands on you.

Which One Fits Your Situation

Buy the thin Miyota automatic if you wear the watch and care how it sits under a cuff. Buy the decorated version if the caseback matters more than one millimeter of thickness. Skip quartz unless the watch is a prop. In every case, judge the seller by the photos they send of your specific watch, because the difference between a good fake Villeret Ultra Thin and a bad one is usually decided before it leaves the bench.