The IWC Portugieser Automatic uses a 42.3 mm case. Replica watches sold as 42 mm Portugieser copy that dial layout: small seconds at 9 o'clock, power reserve indicator at 3, date at 6. The gap between a genuine watch and a replica sits in three places: the movement, the case thickness and the dial print.
Case and dimensions
IWC lists the Portugieser Automatic at 42.3 mm across, 14.2 mm thick, with 3 bar water resistance. Replica cases copy the outline. Measured examples often read 42.5 mm to 43 mm across and 14.5 mm to 15 mm thick. Most replica cases use 316L stainless steel. Genuine steel cases use the same grade, so the metal is not the tell. The tell is finish. Lugs on replica cases show wider polishing bands on the lug tops and softer edges on the bezel chamfer.
Movement
The genuine calibre 52010 runs at 28,800 vibrations per hour with 31 jewels, twin barrels and a 168 hour power reserve. No replica movement matches that. Replica builders use Asian automatic base movements, most from the Seagull ST25 family or the Hangzhou 6 series, with added plates that imitate the Pellaton winding look. The power reserve hand on most replicas is cosmetic. It moves on a fixed linkage, not on spring tension. A replica with a working power reserve indicator costs more and still runs about 40 hours, not 168.
Dial and hands
The genuine dial has applied indices, leaf shaped hands and a printed minute track. Replica dials copy the pattern. Print weight runs heavier. The date window sits at 6 on both. The most frequent fault is subdial spacing on the small seconds. Look at the gap between the 9 o'clock subdial and the center. A wide gap points to a small base movement in a large case.
Crystal and caseback
Genuine watches use sapphire front and back with anti reflective coating on both faces. Replicas use sapphire on the front in most cases. The caseback crystal on cheaper builds is mineral glass. Coating on replica crystals is single sided, so reflections are stronger.
Points to check
- Case diameter and thickness against the 42.3 mm by 14.2 mm reference.
- Power reserve hand behavior.
- Print weight on the minute track.
- Caseback glass material.
- Lug finishing under direct light.
Price for replica Portugieser 42 mm watches sits between about 180 USD and 500 USD. A higher price does not confirm a better movement. Ask for a photo of the movement and a measurement of the case with calipers. Sellers do not publish either in most listings. Genuine IW5007 references trade on the second hand market in the low thousands of dollars. That gap is the reason the replica exists.