The short answer

Buy the version whose case dimensions, dial layout and movement type match the published spec sheet for the authentic reference, not the cheapest listing with the prettiest photos. On a hand-wound Portugieser-style piece like IW545184, the details that separate a good first copy from a bad one are the movement (mechanical hand-wound, not an automatic with a decorated rotor), the placement and depth of the sub-dial, and the weight of the dial printing. Before paying, ask for dated in-hand photos and a short video of the watch running with the crown turned, confirm the return window in writing, and check whether the seller has the exact configuration you are being shown. A seller who cannot provide those three things is not worth the discount.

What to look for

  • Movement type above all. The genuine watch is hand-wound. A replica that hides an automatic movement behind an exhibition case back is the single most common tell, so ask for a photo of the movement with the rotor question answered directly.
  • Dial layout. Sub-dial position, the spacing of the printed track and the length of the hour markers should sit where the original places them. Photograph the dial straight on and compare against a manufacturer image, not against another replica.
  • Printing quality. Look at the logo, the reference text and the minute track under magnification. Thick, merged or slightly fuzzy lettering is the giveaway that shows up in person but not in a compressed listing photo.
  • Crystal. Sapphire with a colourless anti-reflective coating on both faces. Mineral glass shows a blue or purple sheen under a desk lamp and scratches within weeks.
  • Case finishing. Run a finger along the lug edges. Sharper-than-original edges and uneven brushing between the lugs are cheap to fix at the factory and rarely fixed on budget runs.
  • Strap and hardware. Alligator-grain leather is normal. Check that the buckle tang is centred and the spring bars are thick enough to hold a heavier case.

Parameter bands worth checking

  • Case diameter: expect roughly 42 to 44 mm across the family. Ask the seller to state the measurement rather than trusting a listing title.
  • Case thickness: around 12 to 14 mm is typical. Anything under 11 mm usually points to a thin quartz movement or a small calibre sitting in a spacer.
  • Lug width: 20 to 22 mm on most runs. Confirm before ordering a replacement strap.
  • Power reserve: sellers frequently claim an eight-day reserve. A clone hand-wound movement will usually fall well short, so treat any reserve figure as marketing until you test it.
  • Water resistance: treat every replica as splash resistant regardless of what is engraved on the case back. ISO 22810 ratings apply to tested production watches, not to unaudited copies.

Common pitfalls

  1. Stock photos instead of the actual unit. Many sellers reuse factory images across grades. Insist on a dated photo of the serialised case back.
  2. Grade inflation. Labels like mirror grade, super clone or Swiss made are seller vocabulary, not standards. Compare specifications, not adjectives.
  3. Unrealistic power reserve claims. An eight-day reserve requires a genuinely large mainspring barrel. Ask what happens at day four.
  4. No returns on opened watches. If the policy voids returns once the case back is opened, you cannot verify the movement. Get that in writing before payment.
  5. Ignoring the size question. A 44 mm case on a 6.5 inch wrist reads very differently from a 40 mm one. Measure a watch you already own first.
  6. Confusing a replica with an investment. These pieces do not hold value. Buy them as a wearable, not as a store of money.

FAQ

How can I tell if the photos show the real watch I will receive?

Ask for a photo of the watch next to a handwritten card with today's date, plus a ten second video showing the seconds hand sweeping while the crown is wound. Sellers working from stock images will decline or send something generic.

Is a Swiss made replica actually Swiss?

Almost never in the sense the label implies. Most are assembled in Asia with a mix of locally made and imported parts. Judge the movement by its finish and behaviour, not by the engraving.

Should I pay extra for a longer power reserve?

Only if the seller can show the movement and explain the calibre. Otherwise put the money into better dial printing and a sapphire crystal, which you will notice every day.

What should I expect from the finishing?

Good first copies get the case profile and dial layout right. Expect small compromises in hand finishing, engraving depth on the case back and strap quality. Budget for a replacement strap.

Can I resell it as genuine?

No. Selling a replica as an authentic watch is fraud in most jurisdictions. Keep the paperwork you receive and disclose what it is if you ever pass it on.