Short answer
A replica Portugieser 39mm is a third-party copy of the IWC Portugieser dress watch line, listed at roughly 39 mm across the case. That number is loose. Factories measure differently, and the genuine Portugieser Automatic 40 (ref. IW3583) is actually 40.4 mm wide and 12.3 mm thick. So a 39 mm listing is either a slightly smaller case or a rounded-down measurement. Ask for caliper photos before you decide anything.
What the size means in practice
The Portugieser is a dress watch: wide, thin case, slim bezel, long lugs. A 39 mm copy sits close to the real thing on a 6.5 to 7.5 inch wrist. Thickness matters more than diameter. Anything past 13 mm looks wrong under a shirt cuff and hints at a cheap movement inside. Top-tier copies land near 12 mm. Budget ones run 13.5 mm and up.
Lug-to-lug is the second number to check. The original runs about 46 mm. Copies often stretch to 48 or 49 mm, which changes how the watch sits and how much strap shows.
The details that decide quality
Dial and hands
- Applied Arabic numerals, polished with faceted edges. Cheap copies print them flat.
- Railroad-style minute track, thin and even. Blurry or heavy printing means a low-tier dial.
- Feuille (leaf) hands at the correct length. The minute hand should reach the track.
- Small seconds at 6 o'clock. The genuine 40 has no date window at 3. If a listing shows one, it is copying a different reference.
Case finishing
The original mixes a polished bezel and caseback edge with brushed flanks. Look at where the two meet. It should be crisp, not soft or rounded off. Caseback engraving should be deep and easy to read, not laser-etched lightly.
Movement
The real watch uses IWC calibre 82200, a Pellaton-winding automatic with a 60 hour reserve. No copy has that. Common substitutes are Seagull and Hangzhou automatics, a Miyota 9015 with an added small-seconds module, or a decorated ETA clone. None of those is inherently bad. What matters is regulation. Ask for timegrapher numbers: about -10 to +15 seconds a day, amplitude 250 to 300, beat error under 0.5 ms.
Crystal and strap
Domed sapphire with anti-reflective coating on both sides is the target. Mineral glass scratches and reads duller in daylight. Straps are usually alligator-grain leather, fine for daily wear. Swap to a real leather strap if you care about how it drapes and ages.
Price bands
- Under $200: mineral glass, thick case, unregulated movement.
- $250 to $450: sapphire crystal, decent dial printing, regulated movement. Best value in the category.
- $500 and up: closer case geometry, better finishing, often a Swiss or Japanese movement base.
QC checklist before you pay
- Caliper photo of the case, showing both diameter and thickness.
- Straight-on dial shot so you can judge printing and index alignment.
- Movement photo plus a timegrapher readout.
- Side profile shot, since the case curve is where cheap copies fail.
- A written return policy with a window long enough to actually wear the watch.
Red flags
Stock factory photos instead of your specific watch. Claims of Swiss internals with no movement photo. Prices far below the band for the specs listed. Sellers who refuse a QC round or answer measurement questions vaguely. Any of those, walk away and find another source.
The bottom line
A good 39 mm Portugieser copy comes down to three things: honest measurements, a clean dial, and a regulated movement. Get photos of all three before money changes hands, and skip the listings that only show marketing renders. Size and finishing are what you will notice on the wrist every day. The brand name on the dial is not.