Short answer
A replica IW371752 is only worth your money when three things line up: a 42mm steel case with the right thickness and lug shape, a dial with subdials at 12 and 6 and a day-date window sitting dead center at 3, and a real 7750-based automatic inside instead of quartz or a stripped clone. Get those right and the watch wears and photographs like the real thing. Miss any of them and the tell shows up in the first handshake.
The reference in plain terms
IW371752 belongs to IWC's 3717 chronograph family, the steel chronograph line IWC sold through the 2000s before it moved on to the larger 43mm 3777 cases. The formula is familiar: 42mm stainless case, screw-down crown and pushers, a 30-minute counter at 12, running seconds at 6, day and date together at 3, and a Valjoux 7750 base that IWC reworked into its own calibre. Because the family spans several dial colors, handsets and strap options, check the exact dial of IW371752 against IWC's own reference page before you judge any dealer photo.
Where most replicas fall short
Case and lugs
Factory photos hide case proportions better than anything else. I look at thickness first. The genuine case sits around 14.5mm, and plenty of replicas come in at 15.5mm or more, which makes the watch sit tall on the wrist and pushes the crown into your hand. Then the lugs. The real ones curve down toward the wrist with a brushed top and a polished edge, while cheaper cases keep a flat slab profile with soft edges where the brushing meets the polish. That transition line is the fastest visual tell there is.
Dial and subdials
Check subdial placement before anything else. A stock 7750 puts running seconds at 9, so any replica with the seconds hand sitting at 9 is proof the dial does not match the reference. The correct layout wants that hand at 6. Printed numerals should be crisp with no fuzzy edges, and the minute track on the outer ring should be sharp enough to read at arm's length.
Day-date alignment
This is the small detail that gives away most fakes. Cheap dials place the window slightly high, or the disc behind it sits too deep so the letters look dim. On a good replica both discs snap over at the same moment and the font matches the era of the caseback.
Movements you will actually find
Three options show up in this reference. Quartz is the bottom rung: the subdials are decorative and the seconds hand ticks. Then there are 7750-based automatics with a transfer gear that moves the seconds to 6. That gear is the weak point, it adds drag, and a poorly built one can stutter or stop. Better replicas use a properly assembled 7750 with the transfer done cleanly, and those keep time and run the chronograph smoothly. Ask for a video of the chronograph starting, running and resetting to zero before you commit. If the seller will not send one, walk.
Quick pre-purchase checklist
- Case measuring roughly 42mm wide and 14.5mm thick
- Running seconds at 6, chrono minutes at 12, nothing at 9
- Day-date centered at 3 with matching font
- Chrono hands reset to zero cleanly, no overshoot
- Sapphire crystal with anti-reflective coating on the inside
- Crown screws down without grit, pushers have a firm click
- Strap stitching straight, clasp engraving clean and shallow
- Movement photos, not factory stock images
What the price tiers buy
Roughly, under a hundred dollars gets you a quartz watch with the right silhouette and the wrong everything else. The middle tier, a few hundred dollars, is where 7750-based automatics live, and that is the sweet spot for this ref. Above that you pay for better brushing, a sharper dial print and cleaner movement assembly. The jump in quality between the middle and top tier is real but smaller than the price gap suggests.
One honest note
A replica is a replica. The finishing will not match a Swiss watch under a loupe, resale is close to zero, and no service center will touch it. If you want the look on your wrist and you understand that, a well-chosen 3717 replica is a good watch for the money. Buy the case and the movement, not the marketing photos.