Short answer
The IWC Portuguese Chronograph ref IW371407 is a 40.9 mm steel chronograph with two subdials, leaf hands, and no date window. A replica gets it right when the case measures close to 40.9 mm across, the 30-minute counter sits at 12, the running seconds sit at 6, and the profile stays near 12.3 mm thick. The two things that break most replica listings are a date window (that ref does not have one) and a case that comes in at 14 mm or more because of the movement inside. Everything else, dial finish, hand shape, strap, and clasp, is a matter of how much the builder cared.
What the real reference actually is
The 3714 family has been in the Portuguese line for a long time, and the last three digits of the reference tell you the dial color, hands, and case metal. Buyers chasing a specific 371407 should pull up reference photos of that exact code before paying, because the family spans silver, black, slate, and blue dials with gold or rhodium hands. Mixing a dial from one variant with hands from another is a common mistake in replica listings, and it is the first thing I check.
Core specs worth remembering:
- Case: stainless steel, roughly 40.9 mm diameter, around 12.3 mm thick
- Movement: IWC calibre 79350, a modified Valjoux 7750 architecture
- Dial: 30-minute chronograph counter at 12, small seconds at 6, no date
- Hands: feuille (leaf) shape, applied numerals, two-line signature under 12
- Crystal: sapphire with anti-reflective coating, plus a display back on most variants
- Strap: alligator-pattern leather on a steel folding clasp
The movement question decides everything
Because the genuine movement is Valjoux 7750 based, the practical replica option is a 7750 clone, usually Chinese made and often labelled as an A7750. That is good news and bad news. Good, because a 7750 clone gives you a real automatic chronograph with the correct subdial positions and a pusher feel that is close to the original. Bad, because the 7750 stack is tall, so the case has to grow if the builder does not thin the rotor or shave the caseback. That is why the honest spec number matters more than any photo.
Quartz versions exist at the bottom of the market. They keep the dial layout and often look fine in a still photo, but the small seconds at 6 will tick once per second instead of sweeping, and the chronograph pushers feel like a cheap kitchen timer. Ask for a short video of the chronograph being started, stopped, and reset. Any seller who will not send one is telling you something.
Case, dial, and hands: the visual checks
- Thickness: measure with calipers or ask for a photo on a ruler. Over 13.5 mm is a giveaway on the wrist.
- Lug curve: the Portuguese lugs are slim and sweep down. Chunky lugs mean a generic case was used.
- Dial printing: the two-line signature under 12 should be crisp and level. Blurry or bold text is easy to spot at arm's length.
- Subdial rings: look for a fine concentric (snailed) texture and a printed track that does not bleed into the dial.
- Hands: feuille hands should be thin, tapered, and finished to match the variant, gold tone or rhodium.
- Pushers: the chrono pushers should sit close to the case, not stick out like posts.
- Crystal: genuine sapphire has a faint blue or purple tint at the edge from the coating. Bare or hazy glass is a step down.
Case back engraving is worth a close look too. Deep, sharp text and a correctly signed rotor separate the mid tier from the top tier. Shallow laser etching that washes out in daylight is the usual shortcut.
Strap and clasp
The strap matters more than people expect. A thin, glossy, plastic-looking strap drags down an otherwise solid watch. Look for a strap with visible grain, stitched edges, and a soft enough break-in that it curves around the wrist. The folding clasp should close with a firm click and sit flat, with no sharp edges on the inside of the wrist. If the clasp is stamped rather than milled, it will feel light in the hand.
Price tiers and what they buy
- Under about $100: quartz, generic case, printed dial. Fine as a costume piece, not a watch to compare side by side with the real thing.
- Around $150 to $300: automatic 7750 clone, better dial, thicker case, basic finishing.
- Around $300 to $500: corrected thickness, cleaner dial printing, sapphire with coating, better strap and clasp.
- Above that: the top builds, where the case profile, hand finish, and rotor decoration get close enough that you need a loupe and a set of calipers to argue about it.
Whatever tier you buy, be clear about what it is. A replica is not a genuine watch, it will not hold value the way a real Portuguese does, and a watchmaker may or may not want to service the movement inside. Budget for a replacement movement or a full swap down the road.
Questions to send before you pay
- Exact case diameter and thickness in millimeters
- Photographs of the front, back, crown side, and clasp
- A video showing the seconds sweeping and the chronograph resetting to zero
- Timegrapher numbers if the seller has a machine
- Whether the crystal is sapphire and whether it is coated
- Return policy and what happens if the watch arrives with a fault
Get those answers in writing. It takes five minutes and saves a lot of back and forth.