The top pick for anyone searching iw371748 is a reference-first check. Pull the exact dial, case and caliber combination from the maker's own catalog before you look at a single watch, then grade the piece on five points: case proportions, dial printing and subdial placement, hand and marker finish, pusher and crown feel, and movement finish under the caseback. Those five catch nearly every fake in the Portugieser Chronograph family, and they are the same criteria that separate a replica worth wearing from one that disappoints in the hand.
Step 1: Confirm the reference exists
IW371748 sits in the Portugieser Chronograph numbering block, a line built around a roughly 41 mm case, subdials stacked vertically at 12 and 6, leaf-shaped hands, applied markers, and a sapphire display back. The line has run for years with many dial variants, including boutique and limited pieces, so numbers circulate on resale sites that never appeared in a widely published catalog.
- Pros: this step removes unverifiable listings in minutes and needs no watch knowledge.
- Cons: catalog research takes time, and a few legitimate boutique pieces are documented poorly online.
Use case: do this before you message a seller or add a replica to a cart. If the number cannot be matched to a dial photo, treat the listing as unverifiable.
Step 2: Read the case and lugs
The Portugieser case is thin-walled with long, gently curved lugs and a narrow bezel, which is hard to copy at low cost. Fakes usually overshoot thickness, sit tall on the wrist, and use lugs that curve too sharply. Check the transition from lug to case: on a good piece it is a smooth, continuous arc. On a cheap one there is a visible step or a machined ridge.
- Pros of inspecting the case first: silhouette problems are visible in a phone photo, so you can screen sellers remotely.
- Cons: case geometry is the hardest part to judge without a caliper or a side-by-side photo of a genuine example.
Use case: ask for a straight-on profile shot next to a ruler. Sellers who refuse are telling you something.
Step 3: Dial printing and subdial layout
Subdial spacing is the fastest tell. The chronograph minutes counter at 12 and the running seconds at 6 must sit on the vertical axis with even margins, and the outer track should line up with the case opening. Common fake errors include subdials that sit slightly off-center, printed text that is too heavy or sits too close to the subdial edge, and numerals that look flat rather than applied and polished.
- Pros: printing and layout are easy to compare against catalog photos at high zoom.
- Cons: modern replicas print well, so text alone will not settle the question.
Use case: request a macro shot of the 12 and 6 subdials, not a wide dial shot.
Step 4: Hands, markers and crystal
Leaf hands should taper to a clean point, with a polished bevel that catches light along the full length. Markers sit proud of the dial and are polished on the sides. The crystal is sapphire with anti-reflective coating, so it should nearly disappear at an angle rather than showing a blue or purple sheen.
- Pros: hand finish is one of the clearest quality signals in the whole watch.
- Cons: soft lighting hides flaws, so compare only in flat, direct light.
Use case: if you plan to wear the watch daily, prioritize hand and crystal quality over packaging. It is what you look at all day.
Step 5: Caseback, movement and pushers
The display back should show a decorated chronograph caliber with the correct designation for that specific reference. Earlier examples in this family used a modified Valjoux-based movement, while current production uses an in-house caliber, so confirm which one belongs to the number you are buying. Look for consistent graining, a signed rotor, and clean screw heads. Then work the pushers: start, stop and reset should feel crisp, with a defined click and no sponginess. A chronograph that only looks like a chronograph is the clearest sign of a decorative build.
- Pros: movement and pusher feel are the two things a photo cannot fake.
- Cons: you need the watch in hand, or a video of the chronograph running, to judge them.
Use case: always ask for a short video showing the chronograph starting, stopping and snapping back to zero.
What separates a good replica from a poor one
A strong replica gets the case silhouette, subdial spacing and hand finish right, and runs a working chronograph with a movement finished to a believable standard. A weak one gets the dial close and everything else wrong: thick case, soft hands, decorative pushers, and a solid caseback hiding a basic movement.
- Pros of paying for the better tier: correct proportions, a functioning chronograph, and a watch that survives daily wear.
- Cons: higher cost, longer lead times, and fewer sellers who can prove what they are shipping.
Use case: buy the mid or upper tier if you wear the watch weekly. Buy the entry tier only if it is a curiosity for a drawer.
Buying checklist
- Match the reference number to a catalog dial photo.
- Ask for profile, macro dial, caseback and running-chronograph images or video.
- Confirm the caliber that belongs to that reference.
- Check pusher action and crown signature.
- Confirm strap or bracelet type and buckle signature.
- Pay only through a channel with a return window.
Run those six steps and the fake iw371748 problem mostly solves itself. The listings that survive are the ones worth your money, and the ones that fail are the ones that would have cost you a return shipping label and a week of waiting.