The IW371411 is an IWC chronograph reference from the 3711 block. IWC has used the 3711 prefix across more than one chronograph family, so the exact model depends on the catalog year. Confirm the reference against IWC records before you buy. Replica IWC chronographs sell from under $100 to several hundred dollars, and references in this block get copied.
What the reference number covers
IWC reference numbers open with IW, then a four or five digit block that groups a family. The 3711 block covers automatic chronographs built in the late 1990s and the 2000s. Case sizes in that block sit between 38 mm and 42 mm. IWC boutique staff can match a reference to a case number and a build year. No free public database does the same job.
Movement layout
Chronographs in this block use a Valjoux 7750 base, reworked in Schaffhausen. IWC moved the subdials on many models so the chronograph minutes sit at 12 o'clock and the running seconds sit at 6 o'clock. A stock 7750 puts running seconds at 9 and chronograph minutes at 12. Check the layout against the reference you are viewing. A 7750 beats at 28,800 vibrations per hour, which is 4 Hz. The chronograph seconds hand sweeps in small steps, not one tick per second.
Case and crown
Measure the case with calipers. Published dimensions for each reference fall in a narrow range. Replica cases run 0.5 mm to 1 mm off, and the lug profile is soft where a genuine case has a cut bevel. Steel from a genuine case feels cold at first touch. Plated brass does not hold temperature the same way.
The crown on this generation carries the IWC mark or the words Probus Scafusia. Stamped crowns lose detail. Look at the crown under a loupe. Replica crowns show rounded edges and shallow relief.
Dial
Print quality separates most replicas from genuine dials. Use 10x magnification and compare letter spacing to a photo from IWC. Replica dials show thick strokes, uneven gaps, and a white that reads gray. Applied numerals on genuine dials are polished and sit flush to the dial. Replica numerals sit high or show adhesive at the base.
Line up the subdial hands with the printed track. A shift of 1 mm to 2 mm is a replica tell. So is a date window that sits off center.
Caseback and numbers
IWC chronographs from this period use solid casebacks. You cannot see the movement without opening the watch. The caseback carries the reference number and the case number. Cross check both. Replica makers reuse case numbers across large batches, so two watches with the same number is a problem.
Replica tells
- A quartz movement sold as automatic. The chronograph seconds hand ticks once per second.
- Printed subdial hands that never move. Push the chronograph pushers and watch the minute counter.
- Weight. A steel IWC chronograph of 40 mm to 42 mm weighs about 80 g to 110 g on a leather strap. Plated brass copies weigh less.
- Pusher feel. A 7750 has firm pushers with a clear click. Cheap copies feel soft.
- Wrong font on the date wheel, or a date that does not sit square in the window.
- Caseback engraving with shallow depth and rounded letter edges.
Checks that hold up
- Measure the case and compare it to the published size for the reference.
- Confirm the subdial layout matches the caliber IWC used.
- Cross check the reference and case numbers on the caseback.
- Book an inspection at an IWC boutique or an authorized service center. Staff verify case and movement numbers against IWC records.
- Ask a watchmaker with a 7750 parts account to open the caseback and identify the caliber.
Boxes, booklets, and hang tags prove nothing. They are copied at low cost. A service receipt with a matching case number carries more weight.
Price and source
Pre-owned IWC chronographs from the 3711 block sell on the secondary market in the low to mid four figures in US dollars. A complete set adds a premium. An offer far under that range points to a replica, a watch with swapped parts, or stolen goods. Ask where the watch came from and ask for the service history in writing.
Bottom line
No single check settles the question. Use four: dimensions, movement layout, case numbers, and a report from a service center. A seller who refuses an inspection is telling you something.