The short answer

A fake IW3716 fails in three places: the caseback, the subdial hands, and the case thickness. The genuine article is an IWC Portugieser Chronograph ref. 3716 with in-house calibre 69355, a 41mm case about 13mm tall, and a sapphire display back. Replicas copy the front well. Flip the watch over or start the chronograph and the story changes.

What the real ref. 3716 is

The 3716 is the current-generation Portugieser Chronograph, not the older 3714. That distinction matters, because plenty of fakes are built on 3714-era cases with a newer dial dropped in.

• Case: 41mm across, roughly 13mm thick, steel on most references and gold on precious-metal versions.
• Movement: IWC calibre 69355, automatic, column wheel chronograph, 4 Hz, about 46 hours of power reserve.
• Caseback: sapphire display back. This is the single most useful tell.
• Dial: chronograph minutes at 12, running seconds at 6, date at 3, leaf-shaped hands, applied numerals.
• Crystal: sapphire, anti-reflective coated on both faces, which leaves a faint blue cast at oblique angles.

Six things I check on a suspected fake

1. Turn it over

The 3716 has an exhibition back, so you can inspect the movement without tools. A genuine 69355 shows Geneva stripes on the bridges, a decorated rotor, and clean bevels. Fake movements in this segment show stamped surfaces, engraving that sits slightly off-center, and screws that look plated. If a seller hands you a 3716 with a solid caseback, treat the reference number as fiction.

2. Compare the subdial hands

On the real watch, the hands in both subdials reach their tracks and match the leaf profile of the main hands. Replicas tend to fit shorter, flatter hands that stop well short of the printed ring. Check the running seconds at 6 under a loupe. Wobbly, painted, or blunt-tipped hands are a strong signal.

3. Measure the thickness

Genuine 3716 cases come in just over 13mm. Many replicas run 14mm or more because the movement and spacer stack taller. You feel this on the wrist as much as you measure it, and it becomes obvious next to a genuine watch. An overly thick case with a well-finished dial is the classic replica profile.

4. Work the chronograph

Start, stop, and reset the chronograph several times. A column wheel movement gives short, crisp pusher travel, and the reset snaps back to zero in one motion. Clones based on modular or cam-actuated chronographs often feel mushy or stiff, and the seconds hand stutters instead of sweeping. Watch where the hand lands after reset. Genuine examples index cleanly to 12.

5. Read the printing and the date

Look at the logo, the Schaffhausen line, and the printed minute ring. Genuine printing is dense and even under high magnification. Fakes show thinner strokes, uneven spacing, or a minute track that does not align with the applied numerals. Then check the date at 3. The font should match IWC's house style, sit centered in the aperture, and sit at the right depth behind the dial.

6. Check the price and the paperwork

New steel 3716 models sell in the high four figures, and pre-owned examples trade for a few thousand less. No genuine 3716 sells for three digits. A keen price is not evidence on its own, but a deep discount plus vague provenance plus a box with the wrong font on the label is a pattern worth recognizing. Genuine IWC papers list the reference and serial, and those numbers should match the engraving on the case.

If you want a replica, know which one you are buying

The replica market splits into tiers, and 3716 replicas are no exception. The cheap end uses quartz or a basic automatic with a printed dial and wrong proportions. The middle tier gets the dial close and the case size right, but uses a workhorse chronograph movement with a module to fake the 12 and 6 subdial layout. The top tier, often sold as a super clone, spends its budget on the dial, hands, and case finishing. Movement architecture is where the money runs out. Very few replicas carry anything resembling a column wheel, so the pusher feel and the chronograph reset stay different from the real thing.

Practical notes if you go that route. Ask for a timegrapher photo and a video of the chronograph resetting. Confirm that the running seconds sits at 6 and that the date reads correctly under a magnifier. Treat water resistance claims as marketing. And expect service to be difficult, because parts for clone movements are not always available.

Bottom line

A fake IW3716 is easy to separate from a genuine one once you know the reference. The display back, the 13mm case, and the column-wheel feel of the chronograph do most of the work. If any of those three is off, keep your wallet closed.