The replica IW545120 is a copy of the IWC Portuguese Hand-Wound, reference family IW5451. The genuine watch has a 44 mm case, a hand-wound movement, small seconds at 6 o'clock and a sapphire caseback. Copy quality runs from crude to close. The four checks that matter are dial print, movement type, case thickness and caseback engraving.
What the reference number means
IWC builds reference numbers from the IW5451 stem plus a two-digit suffix for case metal and dial. IW545120 reads as IW5451 with suffix 20. Confirm that suffix against IWC's product archive or a dealer catalog before you trust a seller's label. The caseback engraving repeats the full reference, so ask for a macro photo of it.
Genuine specs to compare
- Case width: 44 mm
- Movement: hand-wound calibre 98295, no date, small seconds
- Crystal: sapphire front and caseback
- Dial: applied Arabic numerals, leaf hands, railway minute track
- Water resistance rating: 30 m on the genuine, which is splash protection, not swimming
- Strap: alligator leather on a pin buckle
Treat any water resistance claim on a replica as unproven. Caseback gaskets on copies are the first part to fail.
Dial checks
Zoom on the numerals. Genuine applied markers sit flat with crisp edges and no glue visible at the base. Cheap copies use printed numerals that look flat under raking light, or applied markers with rounded corners and uneven height. Check the railway track: the ticks should be sharp and evenly spaced around the full circle. Look at the small seconds subdial at 6. The hand should sit close to the dial with no visible gap, and the subdial print should not bleed into the main dial.
Movement checks
The genuine is hand-wound. There is no rotor, and the caseback shows bridges. A replica fitted with an automatic movement has a rotor and a case that sits 1 to 2 mm thicker. Ask for a photo of the movement through the back glass and a short video of the watch being wound and running. A hand-wound copy in good order runs 40 hours or more on a full wind. Low-grade copies run 20 to 30 hours and drift 20 to 60 seconds a day. A timegrapher photo gives rate, amplitude and beat error in numbers you can compare.
Case and finish
Measure the case with a caliper and compare the number to 44 mm. Check the transition between the polished bezel and the brushed case sides. On good copies the line is sharp; on poor ones the polish runs over the brushed surface. Look at the lugs: genuine bevels catch light in a thin, even strip. Replica bevels are wider or missing.
Price bands
- Under $150: printed dial, mineral glass, low-grade movement
- $150 to $350: sapphire glass, decorated movement, cleaner dial print
- $350 to $600: closest dial and case work, bridge shapes that mimic the 98 calibre
These bands come from watching listings, not from an official price list. Used genuine IW5451 watches in steel sell in the thousands of dollars, so a $120 copy is not a close copy of anything.
Red flags
- No caseback photo, or a photo that hides the movement
- An automatic movement offered as the correct movement
- Photos lifted from another listing, which a reverse image search will show
- Claims of Swiss assembly with no movement photo to back it
- Payment requests that skip any buyer protection
What no replica matches
Case bevels, engraving depth, dial lacquer sheen under direct light and the feel of the winding train. Budget for a strap change on any copy, and for a movement service on a copy more than two years old. If the seller cannot show the movement and the caseback in his own photos, the watch is not worth the asking price.