The best replica IW371478 for most buyers is the high-tier 41 mm steel chronograph running a modified Valjoux 7750, sold under labels such as A79350. It is the version that gets the two details that decide whether the watch reads correctly on the wrist: an about 41 mm by 13 mm case and a twin-register dial with small seconds at 6 and a 30-minute counter at 12. Every alternative below is judged on those same points plus movement behavior, case finishing, and strap quality.

The reference points to compare against

Before sorting versions, fix the target in your head. The Portugieser Chronograph is a dress chronograph with a clean, open dial, and the numbers below are what a replica has to match.

  • Case: stainless steel, 41 mm across, about 13 mm thick, 20 mm between the lugs.
  • Dial: two registers, small seconds at 6, 30-minute totalizer at 12, leaf hands, railway minute track, applied numerals at 12 and 6.
  • Crystal and back: sapphire front, exhibition caseback on most versions.
  • Water resistance: 30 m, a dress-watch rating rather than a sports one.
  • Movement: the 3714 generation used the 79350, built on a Valjoux 7750 base, while later 3716 references moved to IWC's in-house 69355.

A listing that gives you a diameter, a movement name, and nothing else is not enough to judge. Use the sections below as your comparison sheet.

Criterion 1: Case size and thickness

This is the first filter, because a wrong case cannot be fixed by a good dial. Measured replicas land at 41 mm with a thickness near 13 mm, and that combination is what gives the Portugieser its flat, wide, formal stance under a shirt cuff.

  • Pros of holding out for correct dimensions: the watch sits the way the design intends, 20 mm straps fit without gaps at the lugs, and the caseback curvature matches the wrist.
  • Cons of accepting a shrunken or slimmed case: 39 mm versions crowd the two registers, thin 11 mm cases lose the chronograph's visual weight, and the lugs can sit proud of the strap.

Best for: anyone who wears the watch with tailoring or who will compare it against photos of the real thing. If you only want a large steel chronograph look, a slightly off case will not bother you, but do not pay top-tier money for it.

Criterion 2: Dial layout, printing, and hands

The dial is what people actually look at all day. On a correct replica, the two registers sit on a clean vertical axis, the railway minute track stays thin and crisp, and the leaf hands are slender with a clean center sweep.

  • Pros of a well-executed dial: correct sub-dial spacing, sharp applied markers that catch light at the edges, and a date window that lines up with the printing around it.
  • Cons of a weak dial: thick minute tracks, flat hands with soft edges, misaligned sub-dials that sit too close to center, and date fonts that are too heavy for a dress watch.

Best for: buyers who spend more time looking at their own watch than at anyone else's. Ask for a straight-on macro photo and a wrist shot before you commit, since sub-dial spacing is obvious at arm's length.

Criterion 3: Movement and pusher feel

Three families show up in replica chronographs, and they behave differently enough that the choice shapes daily use.

  • Modified 7750 (A79350 type): correct sub-dial positions, a sweeping small seconds hand, chronograph pushers with real resistance, and a serviceable architecture. The trade-offs are rotor noise on some examples and a thicker mid-case.
  • Quartz: thin and inexpensive, but the seconds hand steps once per second and the pushers feel hollow, which is the fastest way to spot a fake across a table.
  • Decorated automatic with non-working sub-dials: the worst of both, since the registers are printed or frozen and the chronograph does nothing.

Best for: the modified 7750 suits anyone who will use the chronograph and wants the movement to feel mechanical. Quartz only makes sense as a cheap way to test whether you like the design on your wrist.

Criterion 4: Case finishing and strap

Finishing separates a convincing replica from a shiny one. Look for brushed flanks with polished bezel edges, clean transitions between surfaces, and a caseback engraving with depth rather than a shallow laser etch.

  • Pros of careful finishing: light behaves the way it does on the original, the lugs feel soft rather than sharp, and the strap sits flush against the case.
  • Cons of cost-cutting: over-polished edges that round off the case profile, thin sapphire with weak anti-reflective coating, and stiff straps with uneven stitching and a flimsy buckle.

Best for: buyers who plan to keep the watch on leather. Budget for a replacement strap if the supplied one feels rigid, since a decent strap changes how the whole watch reads.

Which version fits which buyer

If you want one watch to wear to work and to dinner, take the high-tier 41 mm automatic with the modified 7750 and spend your attention on dial alignment. If you are new to the reference and unsure about size, start with a mid-tier automatic to confirm the fit, then upgrade. If the watch is a costume piece for occasional use, a slim quartz version will look right in photos and cost the least, as long as you accept the ticking seconds hand.

Checklist before you pay

  1. Confirm 41 mm diameter, about 13 mm thickness, and 20 mm lug width in writing.
  2. Request a straight-on dial photo and check that both registers sit on the center line.
  3. Confirm which movement is inside and whether the chronograph functions.
  4. Ask for a close-up of the caseback and the buckle stitching.
  5. Check the return policy before ordering, since dial alignment is the defect you cannot fix later.