The strongest pick for a replica IW545174 is a hand-wound build on a Unitas 6497 or 6498 base with a small-seconds subdial and a case cut to the reference's measured profile. The criteria that separate a wearable copy from a waste of money stay the same in every price band: case thickness and lug shape, dial printing sharpness, hand geometry, crown size, strap quality, and whether the seller will show you the real movement before you pay.

What the IW545174 reference asks a replica to get right

This is a quiet dress watch in the Portugieser family, and the design is unforgiving. There is almost nothing on the dial to hide behind, so every small error reads from arm's length. Check these points against reference photos:

  • Case profile: a thin, round, polished case with short lugs and a narrow bezel. A thick case with slab sides is the most common tell.
  • Dial: a printed railroad minute track, thin applied or printed indices, and a small seconds subdial. On Portugieser-style hand-wounds that subdial usually sits at 9 o'clock, so confirm the position on the exact reference you are copying before you order.
  • Hands: long, thin leaf or feuille hands that reach the minute track. Stubby or over-polished hands ruin the read.
  • Caseback: most buyers want an exhibition back so the movement is visible. A solid back is easier to fake and harder to resell.
  • Strap: alligator-grain leather on a deployant or pin buckle. Thin, stiff straps make a good case look cheap.

Option 1: Hand-wound Unitas 6497 or 6498 builds

A large, simple, hand-wound movement suits this reference better than any automatic. It is also the easiest base for a small workshop to finish and service. Expect a converted running seconds subdial, leaf or cathedral hands, and decorated bridges.

Pros

  • Proportions match a hand-wound dress watch: thin case, no rotor.
  • Movement is visible through the back and looks the part.
  • Parts and servicing are widely available.
  • Winding feel beats quartz and most budget automatics.

Cons

  • Sub-seconds conversion adds a gear train some shops will not service.
  • Build quality varies between makers, so judge the unit, not the category.

Use case: the right choice if you wear the watch often and want it to feel like a mechanical dress watch on the wrist.

Option 2: Automatic builds

A rotor adds thickness, and on a slim dress reference that thickness shows. Some makers stack a small-seconds module on an automatic base, which adds another layer of height.

Pros

  • No winding needed for daily wear.
  • Often cheaper per unit at the same cosmetic level.
  • Wide supply, so replacement is simple.

Cons

  • Thicker case than the reference calls for.
  • Module service is harder and costlier.
  • Rotor noise and finish quality vary a lot between makers.

Use case: a good pick if you want a daily wearer and can accept a taller case, or if the seller will show calipers on the actual watch.

Option 3: Quartz dress builds

Pros

  • Thinnest profile and the lowest cost.
  • Accurate and low maintenance.
  • Often the only way to hit a sub-9mm thickness at a low price.

Cons

  • A ticking hand on a small-seconds subdial looks wrong to anyone who knows the reference.
  • No exhibition-back appeal.
  • Little to no resale value.

Use case: a travel or beater watch where the look matters more than the movement.

Spec sheet to request before you pay

  1. Case diameter, thickness, and lug width in millimeters, measured with calipers rather than copied from a listing.
  2. Dial macro photo in daylight, straight on, so you can check printing and index alignment.
  3. Movement photo, base caliber name, and whether the small seconds is original to the movement or converted.
  4. Crown size and how it sits against the case at 3 o'clock.
  5. Strap material and buckle type.
  6. Return policy in writing, including who pays shipping on a defect.

Red flags

  • Stock photos only, with no dial macro or movement shots.
  • No measurements given, or measurements that change between messages.
  • Prices far below the rest of the market for the same spec.
  • No stated return window.

Verdict

For a replica IW545174, buy the hand-wound build if you can see the movement and the case measurements first. Step down to quartz only when thinness matters more than feel, and treat automatic versions as a compromise on case height. The maker name matters less than the specific unit you are shown, so ask for photos of the actual watch you will receive, not the catalog render.