The short answer: for most buyers the top pick is a top-tier hand-wound Portuguese build of the IW545143, sold in the trade as a 1:1 or super clone version, because it copies the one thing a cheap replica cannot fake, a hand-wound movement under a display back with the correct dial layout. The runners-up are a mid-tier version with a solid caseback and a budget version that works as a sizing test. The criteria that separate them are the dial variant, the movement type, the caseback, case proportions, crystal material, strap quality and the seller's inspection process.

What IW545143 tells you before you shop

IWC reference numbers follow a fixed pattern: two letters, a four-digit family code and a two-digit variant. IW545143 is family 5451, variant 43. The 545x block of the catalogue is where the Portuguese hand-wound models sit, so this is a hand-wound Portuguese rather than an automatic or a chronograph. That matters for a replica, because the movement is the part of the watch you can see through the back. A copy built on an automatic movement shows a rotor and a different bridge layout, and the trick is obvious to anyone who has handled the real watch.

Dial text, case metal, strap colour and any extra indication on the face change with the variant, not the family. Before you compare sellers, find one clear photo of variant 43 and use it as your reference for the printing on the dial, the position of the subdial and the shape of the hands.

Top pick: top-tier hand-wound build

  • Pros: hand-wound movement with no rotor and the correct bridge shape under a display back; sapphire crystal front and back; sharper dial printing and applied markers; better case finishing on lugs and bezel; strap in real leather with a proper buckle or deployant clasp.
  • Cons: the highest price of the three options; stock moves fast, so the exact variant sells out; a service on a clone movement needs a watchmaker who handles generic parts.

Use case: buy this if you want one convincing watch for long-term wear, you plan to show the back, and you are willing to pay for a build that matches the reference.

Runner-up: mid-tier with a solid caseback

  • Pros: lower price; a solid back hides movement shortcuts; case and dial still look close at arm's length; easier to replace if damaged.
  • Cons: the display back is part of the IW545143 look, so a solid back is a downgrade; the crystal may be mineral; dial print varies more between batches.

Use case: pick this if you want the Portuguese shape on the wrist without paying for a movement display you will not use, or if the watch will see daily knocks.

Budget pick: entry level

  • Pros: lowest cost; useful to test a 40 to 43 mm case fit on your wrist; cheap enough to treat as a travel watch.
  • Cons: thick case; softer dial printing; plated metal that wears through; short power reserve; no sapphire; water resistance claims you should ignore.

Use case: buy it as a sizing test or a knockaround, not as a reference-matching piece.

Checks that decide quality

  1. Dial variant: compare printing, subdial position and hands against a photo of variant 43.
  2. Movement: ask for a photo of the back. There is no rotor on a hand-wound Portuguese.
  3. Power reserve: wind it until it stops, set it down, note when the watch stops. A long-reserve hand-wound build should run for days, and cheap copies will not.
  4. Crystal: sapphire front and back, with an anti-reflective coat that does not wash the dial out in daylight.
  5. Case and strap: check lug shape, crown size, and whether the strap is real leather or embossed synthetic.
  6. Seller: ask for QC photos of the actual unit, timing numbers, and a return window before payment.

Which one fits your use case

If the watch is a long-term wearer and the back will be seen, take the top-tier hand-wound build. If it is a daily beater or a gift, the mid-tier with a solid back gives the look for less. If you are still working out whether the Portuguese case sits well on your wrist, buy the budget version first, then move up. In every case, confirm the variant 43 details and the movement type before you pay, because those two points decide whether the replica reads as the reference or as a generic Portuguese copy.