The short answer: on a fake IW545122, the movement decides the purchase. This reference sits in the IWC Portuguese Hand-Wound family (IW5451), a roughly 44 mm hand-wound watch with small seconds at six, and that is exactly where most replicas cut corners, either by fitting a quartz module or by hiding an automatic under a decorative bridge. Pay only for a watch with a real hand-wound movement, a hacking seconds hand and a clean small-seconds layout. Ask for timegrapher numbers and a photo of the actual movement inside the actual case, and walk away from any seller who shows catalog renders only.

What the reference is, and where replicas drift

The original is a dress watch built around a hand-wound calibre, with a wide, thin case, leaf hands, applied numerals and a subdial recessed at six o'clock. Replica makers get the silhouette right and then lose the plot in three places: the movement type, the depth and finish of the subdial, and the caseback engraving. The case profile matters too. A hand-wound Portuguese sits thin for its diameter. A replica that measures noticeably thicker than the original is almost always an automatic base with a decorative plate on top.

What to check before you pay

• Movement type: confirm hand-wound, hacking seconds, and a power reserve in the 40 to 50 hour range. A subdial seconds hand that ticks once per second is quartz.
• Subdial: it should be recessed, with a crisp printed track and a hand that reaches the markers. Flat, shallow subdials are the most common visual failure.
• Dial printing: check the brand line, the model line and the spacing between them. Blurry or crowded text reads as fake at arm's length.
• Hands: leaf hands should be faceted and polished, not stamped flat and painted.
• Caseback: engraving depth, font weight and serial stamping. Shallow laser etching is a tell.
• Crystal: sapphire with anti-reflective coating. Tilt the watch under a light and look for the faint blue or purple tint.
• Proof: dated photos or video of the specific watch, including a timegrapher screen and a winding test.

Parameter bands worth holding a seller to

• Case diameter: 43.5 mm to 44.5 mm measured across the bezel with calipers. Below 43 mm or above 45 mm and the case was likely borrowed from another model.
• Thickness: thin for the diameter. If it feels slab-sided on the wrist, assume an automatic base.
• Rate: ask for a reading in three positions. Minus 10 to plus 15 seconds per day is a realistic ask at the top of the replica market. A seller who quotes accuracy without numbers is guessing.
• Power reserve: 40 hours or more from a full wind. Test it: wind fully, set the watch down, and check whether it is still running the next evening.
• Water resistance: treat any claim beyond splash resistance as unverified unless the gaskets and crown seals are shown. Do not swim in a replica.

Common traps

• "1:1" and "Swiss made" used as sales lines rather than specifications.
• Stock photos reused across listings, with no QC images of the watch you will receive.
• Sellers who cannot show a movement photo or a winding clip.
• Claims of an eight day reserve. That belongs to a different reference in the Portuguese and Portofino lines, not this one.
• Payment methods with no recourse and no stated return window.
• Ignoring customs risk. Counterfeit watches are seized at borders, and trafficking in counterfeit goods is illegal in the United States and most of Europe.

Practical and legal notes

A replica is a look, not an asset. Resale value is close to zero, many watchmakers will refuse to service it, and you should never represent it as genuine, whether in a sale, at a border or in a repair shop. Buy it as a costume piece you enjoy wearing, keep the receipt, and understand that the seller's legal exposure and yours are not the same thing.

FAQ

Is a fake IW545122 worth buying at all?

If you want the Portuguese look on a budget and accept that the watch has no resale value, a well made hand-wound replica can be satisfying. If you want something you can service, insure or pass on, buy a legitimate dress watch from another brand instead.

How do I tell a hand-wound replica from a quartz one?

Watch the subdial seconds hand. A quartz hand jumps once per second with a hard stop. A mechanical hand sweeps. Then wind the crown with the watch stopped and feel for resistance and a defined click.

Should I expect chronometer accuracy?

No. Expect a few seconds per day either way at best. Ask for a timegrapher photo showing rate, amplitude and beat error rather than trusting a written claim.

Will a local watchmaker service it?

Many will not touch replicas. An independent who works on Asian hand-wound movements often will, but parts availability is the real limit. Ask before you buy.

What about the strap and buckle?

Check stitching density, edge finishing and engraving depth on the buckle. Replica straps are usually the first part to fail, so budget for a replacement leather strap.