Answer first

A fake IW544707 is a copy of an IWC Portuguese watch. No single detail proves a watch is real. Three checks settle most cases: the movement finish under a 10x loupe, the depth of the caseback engraving, and the dial printing. Replica makers copy the outside well. They copy the movement with less care.

What the reference is

IWC reference numbers use the format IW plus six digits. The IW5447 group belongs to the Portuguese family, a line IWC has sold since the 1930s with a large case and a clean dial. Specs shift by production year, so confirm the exact reference against IWC's own catalog before you compare a watch to photos. If the seller cannot name the calibre inside, stop there.

Checks that decide it

Movement

Open the caseback or ask for macro photos. On a genuine IWC hand-wound calibre, Côtes de Genève stripes run in one direction and stop at the bridge edge. Screws are heat-blued steel, so the color shifts in light. A painted blue screw and stripes that run past the edge are copy work. Reference and serial numbers sit cut into the movement, not printed on it.

Dial and hands

Look at the printing at 10x. Genuine text has sharp edges and no ink spread. Applied numerals sit flush with the dial. Subdial positions must match the real layout for that reference. A subdial in the wrong place is the fastest tell, because it means the maker used a different base movement.

Case and caseback

Genuine engraving is cut with a V-shaped groove and sharp shoulders. Copies show a shallow U-shaped cut with rounded edges. Check letter spacing on the reference number and the Probus Scafusia mark. Polished surfaces should meet brushed surfaces on a crisp line, not a soft blend.

Crystal

Many IWC references use sapphire with anti-reflective coating on both sides. A copy often has one side coated, or none. Tilt the watch under a lamp: a strong blue-green sheen with a milky dial points to a single coating.

Crown and winding

The crown carries the IWC mark and sits square to the case. Winding a hand-wound calibre feels smooth with light resistance through the full turn. A gritty, loose or silent crown is a flag.

Price and paperwork

A steel Portuguese hand-wound trades in the low four figures to mid five figures in USD on the secondary market, based on age, condition and set. An offer at a fraction of that with a "full set" claim needs a check. Confirm the warranty card serial matches the caseback and the movement. Ask for service papers. IWC can confirm a serial through its service department.

Where first copy watches differ

Terms like first copy, mirror and 1:1 all describe replicas, and none of them mean the watch is identical to the original. A replica can pass at arm's length. It fails under magnification on three points: movement finishing, engraving depth, and the feel of the winding. Buy the check, not the label.

Bottom line

Judge the movement first, the engraving second, the dial third. Photos at 10x and a serial check with IWC answer more than any seller story.