Short answer

Fake IW371471 watches exist. The number sits in the IWC Portugieser Chronograph 3714 group. Replica factories copy this line in large numbers, so risk is real on the secondhand market. No single check proves a watch is real. Verify the movement, the case back, the dial print, the pusher action, and the papers. If two or more items fail, walk away.

What the reference covers

IWC groups the Portugieser Chronograph under the 3714 family. The last two digits of the number mark a dial and case variant, so IW371471 shares a case shape and movement with its siblings. Confirm the exact dial, metal, and strap with IWC or an authorized dealer before you buy. A catalog number alone does not confirm a build sheet, and parts get swapped.

Price is the first filter. Steel Portugieser Chronographs list near $7,000 to $8,500 new. Gold versions cost more. Clean pre-owned steel examples trade between about $5,000 and $8,000. A listing far under that range, with no service history and no papers, points to a replica or a stolen watch.

Movement

The 3714 generation ran the caliber 79350, based on the Valjoux 7750, with a 44-hour power reserve and 28,800 vibrations per hour. Newer 3716 models use the in-house 69355. Replica sellers print a caliber number on a decorated generic movement. Ask for a movement photo or open the back. A 7750 base shows a rotor with cutouts, a cam, and a lever. The 69355 has a column wheel. If the seller refuses a movement photo, stop there.

Case, crystal, and pushers

Genuine cases measure near 41 mm across, with chamfered lugs and a crown that takes a firm grip. Sapphire covers the dial, and the case back on display models. Pushers on a real chronograph have short, dry travel and reset the hands to zero in one push. Copies often add 1 mm to 2 mm of case width, use coated mineral glass, and use pushers that feel soft or stick.

Dial and printing

Look at the dial under 10x magnification. Genuine printing is thin and sharp. Fake dials show heavy serifs on the IWC lettering, a blurred SCHAFFHAUSEN, and subdial rings that sit off center. Applied numerals on a real watch take a mirror polish on the top face and a brushed side. Replica numerals look plated and dull. Blue dials shift from black to blue as light moves. Painted copies hold one flat tone.

Papers, serial, and price

The case back engraving on a genuine watch is deep and readable, and the serial matches the warranty card. Ask for photos of the serial, the card, the box, and the receipt. A return window of at least seven days matters more than a low price. A seller who answers with stock photos and ships from a warehouse is a reseller of replicas.

Verify before you pay

Take the watch to an IWC boutique or an independent watchmaker. Ask for a rate reading on a timing machine and a look inside. A serviced 79350 runs inside -10 to +15 seconds a day. A counterfeit often runs outside that window and stops when the chronograph runs. Authentication costs little next to the price of a mistake.