Short answer
A replica IW544781 sells for $150 to $900. The price tracks the movement, not the case. Buy from a seller who posts a timestamped photo of the actual watch and a clear movement shot. Confirm the reference engraving on the caseback before payment. If the seller cannot supply a caseback photo, stop there.
What the reference number tells you
IWC groups references in four-digit blocks. The 5447 block sits inside the Portuguese range, which runs from 5441 through 5454. Digits after the block mark case metal, dial color and strap. Two watches from one block can differ in dial color alone.
Public spec pages for the 5447 block are thin. IWC's current site does not carry a full product page for every older reference. Ask for three numbers: case diameter in millimeters, lug width, and the movement caliber. Without those, a replica comparison has no baseline. I could not confirm the factory caliber of IW544781 from public sources. Treat any seller who states it with certainty as a seller who is filling gaps.
Movement tiers
- Quartz: $80 to $180. No sweeping second hand. Easy to spot in a photo.
- Chinese automatic: $150 to $350. Seagull and Hangzhou bases. Decent finish, weaker regulation.
- Swiss ETA or Sellita: $450 to $900. Closer beat rate, better parts supply, serviceable by a local watchmaker.
Check the winding direction and the rotor noise. A hand-wound original paired with an automatic replica is wrong on sight through a display back.
Case and dial checks
- Measure the case with calipers. A 0.5 mm difference shows next to a genuine case.
- Look at the lug-to-lug length. Replica cases often add 1 mm to 2 mm.
- Check printed text under a loupe. Thick strokes and uneven spacing are the common failure.
- Check the date window if the reference has one. Off-center numerals and a mismatched font show fast.
- Check crown engraving depth and thread feel.
Price and seller checks
- Ask for a photo of the watch next to a handwritten date card.
- Ask for a movement photo with the caseback removed.
- Pay with a method that allows a chargeback.
- Compare asking prices for the original on the secondary market before you judge the replica price.
Unknowns
Exact production years for IW544781 are not published in a single source. Water resistance on replicas is untested. Do not swim with one. Service parts for Swiss clone movements come from independent suppliers, not from IWC.