Short answer
The IW371466 is a 41mm Portugieser Chronograph. It takes a 20mm strap and an 18mm buckle. Almost everything sold as a fake accessory for this reference is one of four items: an aftermarket strap, an unbranded deployant clasp, a box with papers, or a steel bracelet. None of those parts are bad by default, and none of them change what the watch is. What separates a good buy from a wasted one comes down to three things: fit, hardware quality, and whether the seller tells you the truth about the part.
Strap sizing you cannot fudge
I measure before I order, every time. Lug width on this case is 20mm, so a 21mm strap will pinch at the lugs and a 19mm strap will leave a visible gap. Buckle width is 18mm, which matters if you plan to keep an OEM buckle or clasp and swap only the leather.
Fake IW371466 Buying Guide: Choosing a Convincing Portugieser Chronograph Replica
- Lug width: 20mm, straight or curved ends
- Buckle width: 18mm
- Spring bar diameter: 1.8mm on most aftermarket sets, 2.0mm on some
- Thickness at the lugs: under 4mm keeps the case sitting flush
Listings lie about thickness more than any other number. Ask for a caliper photo if the strap looks padded in the product shots.
iw371466 fake accessory comparison
Leather, rubber, and the alligator question
Most IW371466 straps on the aftermarket are calf or embossed leather cut to look like alligator. Real alligator costs more than the fake versions by a wide margin, and the difference shows at the edges, where genuine scales have a natural pattern rather than a repeating stamp. Stitching color is the other tell. This reference ships with dark blue or black, and a bright contrast stitch reads as aftermarket from across a table. Rubber is a solid choice if the watch sees water or heat, and it holds up better than leather in humid climates.
Deployant clasps
A deployant clasp is where most cheap accessory kits fall apart. Two styles dominate: single-fold and butterfly. Butterfly clasps lay flatter on the wrist, but the hinge stack adds 3mm to 4mm of thickness, which pushes the case up on a smaller wrist. Check the plating at the fold edges. Cheap chrome or gold plate wears through in months and leaves a copper line that is hard to miss.
Also check the tang width. If the clasp is cut for a 20mm strap and you feed it an 18mm one, it will slide and chew the leather. Match the clasp to the strap, not to the watch.
Boxes, papers, and the resale angle
A box does not make a watch genuine, and paying OEM prices for a generic box is the most common mistake I see. Fitted cushions differ between references, so a box that fits a Portofino will not hold the 41mm Portugieser case the same way. If you want papers for your own records, fine. If you are buying them as an investment, know that collectors check the reference number printed on the warranty card against the caseback, and a mismatch kills the value.
Aftermarket bracelets
Steel bracelets for the 3714 family exist, and most of them are decent. The weak point is always the end link. Fit is judged at the gap where the link meets the lug, and a sloppy end link shows a shadow line that no amount of polishing hides. Check the brushing direction against the case. The Portugieser case carries a fine satin finish, and a bracelet with a coarse grain will look like a spare part.
Before you buy
- Confirm 20mm lugs and 18mm buckle in writing
- Ask for thickness in millimeters, not "thin" or "slim"
- Check the return window, since fit issues show up on day one
- Keep the original strap if you have it. It matters at resale
A replica accessory can dress the watch well or ruin how it wears. The size numbers and the hardware are what decide it.