The best replica IW545170 on the market today is the 43 mm stainless steel build with a hand-wound movement, small seconds at 9 o'clock and a power reserve scale at 3 o'clock. It wins on three criteria: case geometry that copies the original lug taper, subdials placed at the correct height on the dial, and a movement that actually holds a multi-day reserve so the power reserve display means something. Finish and price swing hard between sellers, so use the checks below as your filter rather than a seller's photo set.

What the reference is meant to be

The IW545170 sits in the Portugieser family: a large round case in stainless steel, slim wire lugs, a domed crystal, a narrow bezel, and a hand-wound calibre with an eight day reserve (roughly 192 hours). The dial normally carries small seconds at 9 o'clock, and on versions that show it, a power reserve scale at 3 o'clock. A display back is common. Sellers reuse the same reference string across several dial colours and more than one case size, so confirm the exact layout in writing before you pay.

Top pick: 43 mm stainless steel, hand wound

This is the closest match to the original proportions and the only build worth buying if you want the watch to sit and read correctly on the wrist.

  • Pros: correct 43 mm diameter and case height; wire lugs with the right downward curve; proper subdial spacing; display back shows a decorated hand-wound movement; eight day reserve matches the dial print.
  • Cons: heavier and thicker on the wrist than photos suggest; good examples cost more; hand-wound movements need a service plan if you wear the watch daily.

Buy this one if you want a dress watch you wind once a week and wear with a suit or a knit polo.

Alternative: 42 mm automatic build

Smaller, cheaper, and easier to live with, but it trades accuracy for convenience.

  • Pros: lighter case; automatic winding means no daily ritual; lower price; spare parts are common.
  • Cons: case profile is flatter and the lugs sit differently; power reserve display is usually decorative rather than functional; rotor noise on cheap examples.

Choose this if this is your first large dress watch and you are unsure about winding discipline.

Criterion: the movement

Ask what is inside before you ask about the dial. A hand-wound movement with a genuine long reserve is the whole point of this reference. A short-reserve movement paired with a power reserve hand that never moves is the single most common giveaway. Request a photo of the movement with the caseback off, and ask for a reserve test: full wind, then note how many hours it runs.

Criterion: dial, hands and crystal

Check three things. First, the printed track should be crisp under a loupe, with no ink bleed at the subdial edge. Second, the hands should be the right shape and length, reaching the minute track without overhanging it. Third, the crystal should be domed and slightly proud of the bezel, not a flat disc sitting flush. A dead-flat crystal is the fastest tell from arm's length.

Criterion: strap and buckle

The original ships on alligator with a pin buckle or deployant. Replicas often arrive with stiff, glossy leather and a stamped buckle. Budget for a strap change. A decent alligator-grain strap with a signed pin buckle will do more for the look than any dial upgrade.

What to avoid

  • Sellers who only show front-on photos. Ask for the caseback, the crown side and a wrist shot.
  • Listings that promise a reserve they cannot demonstrate with a timed test.
  • Cases listed as 43 mm that measure under 41 mm at the bezel.
  • Subdials that sit too high or too low, which throws off the whole dial balance.
  • Engraved casebacks on a reference that should have a display back.

Which build fits which buyer

If you want the closest thing to the real watch and you are willing to wind it, take the 43 mm hand-wound build and spend the extra on a strap. If you want a daily wearer with less fuss, take the 42 mm automatic and accept that the reserve display is cosmetic. If you are buying as a gift or a first large watch, size your wrist first: anything under about 17 cm will find the 43 mm case visually dominant, and the 42 mm version will sit better.