The short answer: a replica IW544734 copies an IWC from the Portuguese family, and it is one of the harder references to clone well. The 5447 block of IWC numbers covers a perpetual calendar watch: day, date, month, moon phase and a four-digit year window spread across a busy dial, in a case around 44 mm wide. The digits after 5447 identify the case metal and dial combination, so two watches from the same block can look nothing alike. Confirm the exact variant before you compare any replica photo to the real thing.

What the dial has to get right

A perpetual calendar dial leaves nowhere to hide. Everything is printed or applied in the open, and the eye reads all of it at once. When I look at a replica of this reference, I start at the subdial positions and work outward.

  • Subdial spacing and hand length. Hands that stop short of the track, or overlap it, are the fastest tell.
  • Moon phase disc. The original is a printed disc with a defined sky colour and sharp stars. Clones often show muddy printing or a flat blue circle.
  • Applied numerals and markers. Check the polish on the edges and whether each one sits level with the dial.
  • Date, day and month windows. Crisp apertures with even gaps on all four sides. Ragged edges mean a punched dial.
  • The year window. Four digits in a straight line, not two digits and a blank space.

Why the case matters as much as the dial

A calendar module adds height, so the case is thicker than a plain three-hand watch of the same diameter. A replica that skimps on the module ends up slimmer than the original, which changes how it sits under a cuff and how the lugs look from the side. Case finishing is the other half of the story: brushed flanks with polished bevels, and lugs that taper cleanly into the strap. Rough lug edges and a flat caseback are common on cheaper builds.

Movement choices you will run into

There are broadly two tiers. The lower tier uses a basic Asian automatic with a calendar module and a decorative rotor. The calendar works, but the moon phase is often driven off a 24-hour wheel rather than a proper lunar gear train, so it drifts out of step. Setting is done with pushers or recessed correctors, and those can feel gritty. The upper tier uses a better finished automatic with a smoother winding feel and a moon phase that tracks closer to the real 29.5-day cycle. Neither is a genuine perpetual calendar. Both will need the date corrected after a long stop.

Buyer's checklist

  1. Confirm the variant first: metal, dial colour, strap or bracelet.
  2. Ask for macro photos of each subdial, not just one front-on shot.
  3. Request a short video of the calendar changing. Stills hide stuck discs.
  4. Check that the year window is fully printed and aligned.
  5. Compare case thickness against the published figure.
  6. Ask what happens at month end. A working calendar advances on its own; a cheap one needs help.
  7. Confirm strap width at the lugs, since odd sizes are a pain to replace.

Wear and long-term reality

At roughly 44 mm this is not a subtle watch, and on a dress strap it wears larger than its diameter suggests. Water resistance on any replica should be treated as splash proof at best unless it has been pressure tested. Servicing is the real question. Calendar modules are fiddly, and most local watchmakers will not touch a replica movement, so plan on replacement rather than repair if something fails. Buy the version with the best dial execution, treat it as a wearable piece, and do not expect genuine perpetual calendar behaviour.