Short answer
A replica IW371780 is a copy of the IWC Portugieser Chronograph: a 40.9 mm steel chrono with twin subdials, applied numerals, leaf hands and a clean railroad minute track. Good copies nail the case proportions and the dial layout. Weak copies fall apart on three things: the chronograph movement, the spacing of the subdials, and the printing of the dial text. If you are choosing between two sellers, the movement inside the case is the single most important question to ask.
What the original does that a copy has to match
- Case: roughly 40.9 mm across and about 12.3 mm thick, brushed flanks with polished bezel and lugs
- Dial: recessed subdials at 12 and 6, running seconds low, chrono minutes high
- Movement: in-house calibre 69355, column wheel chronograph, around 46 hours of power reserve, sapphire display back
- Water resistance: rated to 30 m on paper, which means splashes only
Older 3714 references in this family used a Valjoux 7750 base. Plenty of copies still use an Asian 7750, and that single fact drives case thickness, pusher feel and how the subdials sit on the dial.
The movement decides the tier
An Asian 7750 is a workhorse and it is what most honest mid-range copies run. It gives you a smooth sweep, a real chronograph and a pusher action with some weight behind it. A quartz copy looks fine in a photo and feels dead in the hand: the chrono hand snaps instead of sweeping, and the pushers have no travel. Ask directly which movement is inside, then ask for a short video of the chronograph being started, stopped and reset. Sellers who cannot produce that clip are reselling stock they have never handled.
Dial and case checks
- Subdial positions should line up with the genuine layout. Shifted subdials usually mean a smaller movement in a bigger case.
- Printing should be crisp under a loupe. Fuzzy text on a Portugieser is the fastest tell there is.
- Applied numerals should sit flat with no visible glue halo.
- The date window should be cleanly cut and centred, not a punched hole with rough edges.
- Lugs should be slim and slightly curved. Chunky lugs read as a different watch entirely.
Price tiers to expect
- Entry, roughly $100 to $180: quartz or a low-grade automatic, thin plating, printed subdials
- Mid, roughly $250 to $450: Asian 7750, decent dial, correct-ish thickness
- Top, roughly $500 to $800: better finishing, closer subdial spacing, sapphire crystal, solid bracelet or strap hardware
Anything far below the entry tier is usually a photo of a better watch than the one that ships. Compare the same angle and lighting across sellers before you commit.
On arrival, check these in order
Wind it fully and let it run a day. Start the chronograph and reset it five times to make sure the hands return to zero. Check the crown for wobble and the pushers for grit. Look at the dial under direct light for dust or smudges under the crystal. Then set the date and confirm it flips cleanly at midnight rather than drifting. Catching these in the first week is much easier than arguing about them in month three.
Bottom line
The IW371780 copy is worth buying when the movement is a real automatic chronograph, the subdials sit where they should, and the dial printing holds up close. Skip anything quartz, and skip sellers who will not send a working video. Those two filters remove most of the junk from a wholesale list.