What a replica IW371497 is
A replica IW371497 is a copy of the IWC Portugieser Chronograph, a 41 mm steel watch with a twin-register dial, feuille hands, and a chronograph movement built on the Valjoux 7750 architecture. Copies run from about $60 quartz models to $400 or more automatic versions that reproduce the calibre 79350 layout. The reference suits replication well because the dial is uncluttered, the case is a plain round shape, and the base movement has been manufactured in volume for decades.
Before you shop: know the target specs
- Case: 41 mm across the bezel, roughly 12.6 to 13.1 mm thick, stainless steel with polished bezel and lugs
- Dial: silver-plated or black, applied Arabic numerals, feuille hour and minute hands, 30 minute counter at 12, running seconds at 6, no date window
- Crystal: domed sapphire with anti-reflective coating on both faces
- Movement: calibre 79350, a modified Valjoux 7750, 28,800 vph, about 44 hours of power reserve
- Strap: alligator or calf leather, steel pin buckle or deployant clasp
How to evaluate a replica IW371497
- Ask for caliper photos. A 41 mm claim should measure between 40.8 and 41.2 mm across the bezel, and thickness should stay under 13.5 mm.
- Check the lug profile. Originals taper and curve down from a thin case band. Thick slab sides or straight lugs sit wrong on the wrist and mark a low tier case.
- Study the dial print. Numerals sit on the inner track, and edges stay sharp at 10x magnification. Fuzzy outlines or uneven spacing point to pad printing done on the cheap.
- Compare the two registers. The 30 minute counter at 12 and the small seconds at 6 should both be recessed with a snailed finish, and the hands should match original lengths.
- Inspect the hands. Feuille hands taper to a fine point with a polished bevel. Flat stamped hands with rounded tips are a giveaway.
- Cycle the chronograph. Start, stop, and reset ten times. Pushers should click without grinding, and the reset should snap the counter hand back to zero in one motion.
- Look at the case back. A mid tier or high tier copy shows a decorated 7750 with Geneva stripes, blued screws, and an engraved rotor. A bare movement or a quartz blank lowers the value.
- Test the crystal at an angle. Under a lamp, a proper double AR coating removes most reflections and gives the dial edge a blue cast. A plain glass crystal washes the dial out.
- Examine the strap and buckle. Stitching should be even along the whole length, and the buckle engraving should have depth rather than a shallow laser burn.
Red flags that end the deal
- Photos that skip the case back, the movement, or the side profile
- A quartz movement sold as automatic
- Subdials pushed toward the center, which breaks the spacing of the original layout
- Water resistance claims above 30 m with no pressure test report
- A price under $100 for anything described as a Swiss movement
Price bands and what they buy
Quartz copies sell for $60 to $120 and work only as a visual stand-in. Entry automatics with an undecorated 7750 run $150 to $250. Decorated automatics with a correct dial and case finish start near $300 and reach $450 for the best examples. Past that point you are paying seller markup, not better parts.
After the watch arrives
- Run the chronograph for five minutes each month to keep the gear train and lubrication moving.
- Have a local watchmaker regulate the movement if it drifts more than 15 seconds per day.
- Keep the watch away from showers, pools, and dishwater unless a pressure test confirms the gasket seals.