Buy the replica Portugieser Automatic 31 only when the case profile, dial layout, and automatic movement feel match the original closely enough for your standards. Prioritize a 42 mm case with correct subdial positions, a 31-jewel automatic movement that winds and sets smoothly, and a dial with clean printing and aligned applied markers. Skip listings that hide case thickness, show a generic movement, or promise Swiss origin without proof. Also confirm that importing a replica is legal where you live, because customs can seize trademark-infringing goods.

What to look for in a replica Portugieser Automatic 31

Case and dimensions

The original Portugieser Automatic uses a large, slim case. A good replica should sit near 42 mm wide and about 14 mm thick. The lug width should be 22 mm, and the lug-to-lug span should stay near 50 mm so the watch wears like the real model instead of a slab. Check the bezel slope, polished and brushed transitions, and the crown size. A case that is too thick or too wide changes the whole look.

Dial and hands

Look for a clean dial with applied numerals or markers, feuille hands, a small seconds subdial at 9 o'clock, and a power reserve indicator at 3 o'clock. On models with a date, the date window should sit at 6 o'clock with a matching font. Printing should be sharp. Markers must align with the chapter ring and not float or tilt. The hands should have even lume or polish and no burrs. A wobbly subdial hand or a date wheel that sits off-center is a clear sign of low effort.

Movement

The keyword 31 points to the jewel count often cited for the original IWC caliber. In a replica, 31 jewels is a specification claim, not a quality guarantee. Ask for a clear movement photo and a short video. The rotor should spin without grinding, the winding should feel smooth, and the hands should set without play. A clone automatic with 31 jewels can work well, but a cheap 21-jewel movement with a decorated plate may look busy and run poorly.

Crystal, caseback, and strap

Sapphire crystal with anti-reflective coating is the baseline. Mineral glass scratches and lacks the same clarity. The caseback engraving should be crisp and centered. Strap options should match the lug width and include a proper buckle or deployant clasp. Leather quality matters for comfort, but it is easy to replace. A bad strap is not a reason to reject an otherwise good watch.

Parameter bands that matter

  • Case diameter: 42.0 to 42.5 mm
  • Case thickness: 13.8 to 14.5 mm
  • Lug width: 22 mm
  • Lug-to-lug: 49 to 51 mm
  • Water resistance: 30 to 50 m for daily splash protection, not swimming
  • Movement: automatic, 28,800 vph preferred, 31-jewel claim with smooth sweep
  • Power reserve: 40 to 120 hours depending on movement design
  • Crystal: sapphire with AR coating
  • Dial: small seconds at 9, power reserve at 3, date at 6 when present
  • Strap: 22 mm leather with matching buckle or deployant

Pitfalls to avoid

  • Listings that rely on 1:1 marketing without real photos
  • Case thickness above 15 mm or below 13 mm
  • Subdial positions that differ from the original layout
  • Date font that is too large, too bold, or placed at 3 o'clock
  • Rotor noise, rough winding, or hands that move when you set the time
  • Caseback spelling errors, shallow engraving, or wrong reference text
  • Claims of Swiss made on a replica with no movement documentation
  • No customs or legal disclaimer from the seller

FAQ

Is the 31-jewel movement the most important factor?

No. Jewel count is one data point. Case geometry, dial accuracy, and movement behavior matter more. A 31-jewel movement with a misaligned dial is still a poor replica.

Can I swim with a replica Portugieser Automatic 31?

Do not assume so. Most replicas are rated for 30 to 50 m, which means splash resistance at best. Gaskets may be inconsistent. Keep it away from pools, showers, and salt water unless a watchmaker pressure-tests it.

How can I check the case size before buying?

Ask for caliper photos or a side-by-side photo with a ruler. Compare the numbers to the original specs. If the seller avoids measurements, move on.

What should I inspect when the watch arrives?

Check the sweep, date change, winding feel, crown operation, dial alignment, and caseback engraving. Put it on a timegrapher if you can. A local watchmaker can regulate a rough movement, but cosmetic flaws are hard to fix.

Are replica watches legal to buy?

Laws vary by country. Replicas infringe trademarks, and customs may seize them. Check your local import rules before you order. This guide does not replace legal advice.