The short answer

A replica IW545105 copies the IWC Portuguese Hand-Wound, a large, thin dress watch with leaf hands, a small seconds subdial at 6 o'clock, and a manual wind movement. Quality on a copy comes down to four things: case diameter and thickness, dial printing and subdial placement, hand shape, and the movement inside. If the movement is an automatic or the subdial sits in the wrong spot, the watch fails on sight and no amount of case polishing fixes it.

What the reference is

The 5451 family belongs to the Portuguese line, the collection IWC built around clean, oversized pocket-watch style dials with thin bezels and long, slim lugs. Reference 545105 is one variant within that family, so dial color, index style, and caseback treatment vary between versions of the same base reference. Before you judge any copy, open IWC's own product data or a reference database and confirm what the genuine 545105 looks like: dial finish, whether the back is solid or glazed, and the calibre number. Judge the replica against that photo set, not against a listing photo.

How to check a replica IW545105 step by step

  1. Confirm the reference. Pull up the genuine specification first, including case size and calibre, and write the numbers down.
  2. Measure the case. Use digital calipers across the bezel at 3 and 9 o'clock, then measure thickness from caseback to crystal. A copy that comes in several millimeters small is a different watch wearing a Portuguese style dial.
  3. Examine the dial at arm's length, then under a loupe. Check that the subdial is centered at 6 o'clock, that printed text sits level and sharp, and that applied indices line up with the chapter ring.
  4. Check the hands. They should be thin leaf or feuille shapes, correct length, and finished on all sides. Stamped, flat hands with burrs are the most common tell on cheap copies.
  5. Wind the watch. The crown should pull out cleanly, wind with light resistance, and set the hands without grinding. A real hand-wound movement has no rotor, so there should be no spinning weight feel on the wrist.
  6. Count the beat. Film the small seconds hand in slow motion and count ticks per second. A high-beat movement shows 8 ticks, a low-beat movement shows 6, and the wrong count points to a substituted movement.
  7. Inspect the caseback. Look at engraving depth, font consistency, and whether the serial and reference numbers match the paperwork or listing. Shallow laser etching is a warning sign.
  8. Check the strap, buckle, and spring bars. Leather quality, stitching, and buckle finishing are the last places a maker cuts cost.

Red flags that end the inspection

  • Subdial positioned above or below the 6 o'clock marker instead of centered on it.
  • Case diameter off by more than about 1 mm from the genuine figure.
  • Thick, slab-sided case with no lug taper.
  • Automatic movement visible through a display back where a hand-wound calibre is expected.
  • Printing that flakes, smears, or sits unevenly on the dial.
  • Seller who cannot show a clear caseback photo or a timed video of the running movement.

What copies usually get wrong

Case thickness and dial print are the two repeat problems. Manual wind movements used in copies tend to be thicker than the original calibre, so the case grows and the watch loses the flat profile that defines a Portuguese dress watch. Dial print on budget copies is often pad printed too heavily, which rounds the edges of thin text. Subdial hands are frequently the wrong length or the wrong shape, and the small seconds track may sit too far from the dial center. None of these are fatal on their own, but two or three together change the silhouette.

Price and expectation setting

Copies of this reference sit in a wide range. Entry examples use generic movements and printed dials. Mid-tier examples use a hand-wound movement with better finishing, sapphire crystal, and a closer case profile. Top-tier examples chase case dimensions and dial detail closely and cost several times more. Set your budget against the checks above, and remember that the movement type matters more than the logo on the dial, because it decides whether the watch winds, holds time, and feels correct on the wrist.

Care after purchase

Keep a hand-wound copy wound on a regular schedule rather than letting it sit stopped for months. Do not swim with it unless the seller documents the gasket work, since case seals on copies are rarely tested. Store it away from magnets and have the movement serviced when accuracy drifts beyond about 20 seconds a day. A cheap service is usually less than a replacement movement and extends the life of the watch by years.