A 45mm Portugieser replica is worth your money when the case measures what the listing claims, the dial keeps the classic layout (small seconds at 9, power reserve at 3, date at 6), and the movement is a real automatic instead of a quartz module sitting behind a decorated plate. That combination is our top pick. The checks below take a few minutes, a ruler, and a phone camera, and they tell you more than any photo gallery will.
What the 45mm label means
IWC builds the Portugieser in several case sizes, and the genuine line runs from about 41mm to about 45mm depending on the reference and the complication. A listing that says 45mm is either copying a larger reference or scaling a smaller one up to chase the oversized look. Both can work on a big wrist. Trouble starts when the seller quotes 45mm and ships a 42mm case, because the dial proportions, the strap width, and the lug spread stop agreeing with each other.
Ask for one photo of the case beside a ruler, measured across the case body at the widest point and not across the crown guards. A seller who understands the question knows the product.
Top pick: steel, three-register dial, leather strap
This is the build that gets the Portugieser look right, and it is the one to hunt for in a 45mm case.
Pros
- The three-register layout reads as intended: running seconds at 9, power reserve at 3, date at 6.
- A 45mm steel case with wide lugs takes a large range of aftermarket straps.
- An exhibition caseback lets you inspect movement finish before you pay.
- Leather with a deployant clasp wears closer to a dress watch than a bracelet does.
Cons
- A 45mm case sits large on wrists under about 7 inches, and long lugs can overhang the arm.
- Oversized builds tend to run thick, so the watch will not slide under a shirt cuff.
- Movement decoration is the first place cost shows up.
- Water resistance claims cannot be trusted, so keep it away from pools and showers.
Movement: the part photos hide
Genuine Portugieser automatics in this family are known for manufacture calibres with a long power reserve and Pellaton winding, a pawl-based system that winds on both directions of the rotor swing. A replica that shows a power reserve hand on the dial should run a real automatic with a comparable reserve. If the reserve hand is painted on, or the watch dies overnight, the dial is decoration.
Ask three questions: does it wind by rotor, how many hours does it hold once you take it off, and does the caseback open to a finished movement or a sticker. A quartz movement inside a 45mm Portugieser case is the most common shortcut, and you can spot it by the ticking second hand.
Dial, crystal and hands
Look at the subdial hands. They should reach into the track, not hover short of it. Applied indices should sit flat with no glue haze, and the date window should be centered in its aperture rather than nudged to one side. Ask for a sapphire crystal with an anti-reflective coating; mineral glass scratches and shows it fast. Blued or polished hands should catch light along the whole length, not just at the tip.
Case, crown and caseback
Run a fingernail along the case flanks. Sharp edges and uneven brushing on a 45mm case are easy to feel and easy to see under daylight. The crown should pull to setting positions with a firm click and screw down without grit. On the caseback, engraving should be crisp and centered, and the reference text should match the dial you ordered.
Strap, clasp and daily wear
A 45mm case needs a strap wide enough to balance it. Measure the lug width on arrival and match it to the strap you were promised. Alligator-grain leather looks right for the model; a soft rubber or canvas strap suits casual wear. Check that the buckle or deployant closes with a positive snap, because a weak clasp on a heavy case is how watches end up on the floor.
Buying checklist
- Confirm measured case diameter with a ruler photo.
- Confirm movement type: automatic, with the reserve duration stated.
- Confirm sapphire crystal and coating.
- Confirm dial layout: seconds at 9, reserve at 3, date at 6.
- Confirm lug width and strap material.
- Confirm return terms before payment.
- Photograph the watch on arrival and test the power reserve overnight.
Which wrist and which use case
If your wrist measures 7.5 inches or more and you want a dress-leaning statement piece for the office, the 45mm steel automatic on leather is the sensible pick. Under 7 inches, step down to a 42mm build with the same dial layout, which keeps the proportions intact. For travel and daily wear under sleeves, a thinner case wins every time, and the 45mm belongs in a rotation rather than on the wrist seven days a week.