What "fake IW3717" means online

Top pick: a clone-grade build with a 7750-based automatic chronograph movement, sapphire crystal with anti-reflective coating, a correctly sized steel case, and applied indices. That tier is the closest visual match to an IWC Portugieser Chronograph without a five-figure outlay, and it is the one worth hunting. Everything below explains what the reference number refers to, which details separate a serious build from a disposable one, and where each tier makes sense.

"IW3717" is the shorthand buyers use for a reference family in the IWC Portugieser Chronograph line. The watch behind the number is a two-register chronograph: running seconds at 6 o'clock, a 30-minute counter at 12, a date window at 3, a thin bezel, and a dial that leaves a lot of open space. That simplicity is exactly why the fake market is crowded and uneven. A clean dial with two subdials hides nothing, so a cheap copy looks cheap from across a table.

Three tiers show up again and again. Entry builds use quartz or a low-grade automatic and a plated case. Mid builds use a 7750-based automatic chronograph with mineral glass or budget sapphire. Clone-grade builds use the same 7750 base with better finishing, coated sapphire, and a dial with applied indices instead of printed markers.

One clarification before you spend anything: "fake" and "replica" describe the same object. The difference is the seller, and whether that seller will tell you what movement is inside.

Top pick: the clone-grade 7750 build

If you want one answer, take the clone-grade 7750 build. It is the tier where the chronograph actually works, the pushers have a defined click, and the case profile holds up at arm's length.

Strengths

• Working chronograph with a 30-minute totalizer and a reset that snaps back to zero.
• Sapphire crystal with coating, so the dial reads clearly at angles where mineral glass hazes out.
• Applied indices and a stamped dial plate that survive close inspection.
• Case thickness and lug shape stay in the right range, so the watch sits the way the design intends.

Weaknesses

• Heavier and thicker than the genuine article, because the 7750 base is a thick movement.
• Service is a real cost. A 7750-based chronograph needs a watchmaker, not a battery swap.
• Resale value is close to nothing, so buy it to wear, not to hold.

Choose this tier if you wear the watch weekly, use the chronograph, and want the closest visual match available.

Criterion one: movement and chronograph behavior

The movement decides everything downstream, including case thickness and how the pushers feel. Ask the seller for the movement name in writing. If the answer is vague, assume the worst.

Strengths of a 7750-based build

• Proven architecture that any competent watchmaker can service.
• Smooth sweep and a chronograph that starts, stops, and resets as it should.
• Parts availability, which keeps long-term ownership possible.

Weaknesses

• Thicker than the genuine in-house calibre, so it never sits quite as flat.
• Rotor noise is noticeable on cheaper examples.
• Quartz versions in this case style often fake the subdial layout, with a counter that never moves.

Best for: anyone who will actually use the stopwatch function. Skip it if you want a thin, quiet dress watch.

Criterion two: case, crystal, and proportions

Measure before you buy. Case diameter, lug width, and thickness are the three numbers that separate a good copy from a bad one, and sellers rarely publish all three.

Strengths

• Correct diameter and lug spacing mean standard straps fit without gaps.
• Sapphire with anti-reflective coating reduces the flat, milky look that gives cheap copies away.
• Polished and brushed surfaces separated properly, so the case reads as one object rather than a set of parts.

Weaknesses

• Plated or coated finishes wear through at the lugs and crown guards with daily use.
• Caseback engraving is often shallow and misaligned.
• Crown action feels gritty on lower tiers.

Best for: buyers who handle the watch often or let other people try it on. Choose a steel finish, not a coated one.

Criterion three: dial, hands, and printing

The dial is where the money shows. Look at the subdial rings, the index edges, and the spacing between the printing and the center hole.

Strengths

• Applied indices cast a real shadow, which printed markers never do.
• Sharp subdial rings and even printing at 12 and 6.
• Hands with polished edges, and a sweep second hand that reaches the track.

Weaknesses

• Thick printing that closes up small text.
• Subdial hands that sit too high or too low.
• Color drift, with white dials turning gray or cream turning yellow.

Best for: buyers who photograph their watches or work around people who notice details.

What no replica gets right

Be honest about the ceiling. Movement finishing under the caseback, the exact tone and depth of the dial lacquer, and the long-term accuracy of an unserviced 7750 are the three places a copy stays a copy. None of that is visible from normal conversation distance, but all of it matters if you plan to hand the watch to a jeweler or open the caseback at a meetup.

Matching the tier to your use case

1. Daily wear with the chronograph in use: clone-grade 7750 build.
2. Occasional dress wear with thin profile as the priority: mid tier, and accept the compromises.
3. One-time costume use or a display piece: entry tier is enough, and do not pay more.
4. Collecting and long-term holding: buy the genuine watch instead, because no replica holds value.

Whichever tier you land on, get the movement name, case dimensions, and crystal type in writing before payment, and buy from a seller who answers technical questions without deflecting. That single habit filters out most of the bad copies on the market.