The code IW93870 turns up in replica wholesale catalogs, not in IWC's own reference list. IWC writes references as IW plus six digits tied to a model family, dial variant, and production run. The 93 block is not one you will find across the Portugieser, Pilot, or Ingenieur lines. So treat IW93870 as a seller SKU, a shorthand one factory or wholesaler uses to label a single build. Two sellers can print the same code on watches with different movements, case thickness, and dial finishing, which is why the code alone tells you very little.
What the listing usually describes
Most pages carrying this code show a similar package, so you can compare apples to apples once you know the baseline:
- Case size of about 42 to 43 mm, stainless steel, brushed flanks with polished edges
- Automatic chronograph layout with two or three registers and a date window
- Sapphire crystal, sometimes with a single-sided AR coating
- Sapphire or solid caseback depending on the tier
- Stated water resistance of 30 to 50 m, which is a marketing number on a replica, not a diving rating
- Leather strap or a steel bracelet with push-button clasp
Movement tiers hidden under one code
This is where the money goes. Four builds routinely share the same SKU:
- Quartz. Thin, cheap, and the chronograph hands often snap to zero instead of sweeping.
- Chinese automatic chronograph, usually a 7750 pattern. Runs at 28,800 vph, has a rotor you can hear, and can be serviced by a local watchmaker if parts are available.
- Seiko NH-series or a modified 7753 clone used in slimmer cases.
- A genuine ETA 7750 or Sellita SW500, which pushes the price up sharply and usually comes with documentation.
Ask which one is inside before you pay. The subdial spacing and the date position change with the movement, so a photo of the dial tells you a lot about what is under it.
What I check on arrival
Subdial spacing is the first tell. On a real chronograph the registers sit where the movement puts them, not where the dial printer wanted them. Then case thickness, because a 7750 build adds roughly a millimeter over the original profile. After that, dial printing under a loupe, the crispness of the date font, and whether the crown screws down with a smooth thread. Bracelet end links should sit flush against the lugs with no gap you can slide a fingernail into. Weight is a rough guide too, since a hollow bracelet feels obvious in the hand.
Sizing and daily wear
A 42 to 43 mm case with a chronograph bezel wears larger than the number suggests. On a 6.5 inch wrist it will look substantial, and the pushers can catch on a shirt cuff. If that matters, look for the 40 mm variant some sellers list under the same code and confirm the measurement in the spec table rather than the photos.
Price bands
Quartz builds land at the bottom. Automatic 7750 copies sit in the middle and are the sensible choice for anyone who plans to wear the watch. Swiss-movement builds cost several times more, and at that point you are comparing against used entry-level chronographs from real brands, which is a decision worth making slowly.