What is a fake IW371613 longtail?
A fake IW371613 longtail is a replica built to imitate the IWC Portugieser Chronograph reference IW371613, sold through listings that stretch a single reference number across a long tail of dial, strap, and movement combinations. Most of those combinations never existed in the IWC catalog. The phrase is a buying signal, not a model name.
Fake IW371613: How to Judge a Portugieser Chronograph Replica
Buyers who search this term want one outcome: a short list of physical checks that separate a faithful build from a mismatched one. That list is below.
Does IW371613 exist as a real IWC reference?
Yes. The IW3716 family is the Portugieser Chronograph line, and the six-digit suffix identifies a specific case metal, dial color, and strap pairing. A seller who cannot name those three details for IW371613 is guessing at the reference.
Open the official IWC catalog before you judge any replica. Photograph the dial layout, the printed text, and the strap code, then compare side by side.
How do you spot a fake IW371613? Five checks
1. Case thickness and profile
The genuine Portugieser Chronograph measures about 41 mm across and sits near 13 mm tall. Replicas built on a modular chronograph movement run 14 mm to 15 mm and read as slab-sided when viewed from the side.
Ask for a caliper photo against a flat surface. A number on a spec sheet means little.
2. Subdial spacing and date aperture
The chronograph counters sit high and low on a clean vertical axis, and the date window aligns with the outer minute track. Replica dials push the counters toward the center and drop the date window a fraction low.
Line up a straight edge through both subdial centers. Any lean is a tell.
3. Dial printing and applied numerals
Genuine printing is crisp at 10x magnification, with even stroke weight on the brand text and the model line. Replica printing shows fill-in on thin strokes and heavy serifs on the applied numerals.
Look at the minute track. Uneven spacing between hash marks is common on low-tier dials.
4. Caseback engraving and serial
Deep, sharp engraving with consistent letter height marks a genuine caseback. Replica engraving is shallow, and the serial stamp often repeats across unrelated listings.
Search the serial number. If it appears on five listings in three countries, the case is not what the seller claims.
5. Crown, pushers, and strap hardware
Genuine chronograph pushers travel with firm, even resistance and return with a clean click. Replica pushers feel spongy or grind at the end of travel.
Check the buckle engraving and the strap stitching pitch. These are the parts replica factories skip first.
What does longtail mean in replica listings?
Longtail describes the search tail around one reference: dozens of listings that reuse IW371613 to cover builds with different dials, movements, and straps. The reference becomes a keyword rather than a description.
- Same reference number, mismatched dial colors
- Case metal listed as steel in one photo and two-tone in another
- Sapphire caseback photos borrowed from a genuine watch
- Movement described as in-house with no photo of the rotor or balance
- Strap codes that do not appear in the IWC catalog for that reference
What do replica IW371613 tiers cost?
Entry builds sit near $200 to $300 and show the thickness and printing flaws first. Mid tiers land around $350 to $500 with better dial finishing. Top tiers reach $600 and up, and even those fail a movement comparison next to a real caliber.
Price is a filter, not proof. A high asking price on a longtail listing with recycled photos tells you nothing about the watch.
Frequently asked questions
Can a watchmaker identify a fake IW371613 from the movement alone?
Usually yes. Movement architecture, finishing on the bridges, and the rotor engraving are visible through a sapphire caseback, and a trained eye reads them in seconds.
Is every longtail listing a scam?
No. Some sellers list honest replica builds and label them as replicas. The problem is the listing that borrows a reference number and genuine photos to imply something the watch is not.
Should I ask for dated photos of the actual watch?
Always. A photo with a handwritten date card next to the caseback settles more questions than any description, and a seller who refuses has answered one too.