The strongest option for a replica IW93879 is the 1:1 super-clone tier: a cloned automatic movement with correct rotor engraving, a case machined to the original reference dimensions, and dial printing that matches the genuine font weight and layout. The criteria that separate a convincing copy from a costume piece are consistent across every model: whether the code in the listing maps to a real watch, whether the movement beats at the right rate in the right direction, how the case flanks and lugs are finished, how the dial and date wheel are printed, how the crystal handles reflections, and how the bracelet end links meet the case. Below that tier, the differences show at arm's length.

Step one: confirm what IW93879 actually is

IWC references normally carry an IW prefix and a digit string, and the brand also uses long multi-digit caliber numbers. Sellers blend the two, so a number like 93879 turns up in listings as a case code, a movement caliber, or an internal stock number copied from a wholesale sheet. Check the number against the manufacturer's own catalog page before you commit. If it returns no watch, the listing is describing a generic model, and you should judge the object on its own merits rather than on reference accuracy.

  • Pros of verifying first: you learn the correct case diameter, lug width, and complication set, which gives you a checklist for the photos.
  • Cons: it takes time, and some sellers will not answer questions about which reference they copied.

Use case: anyone spending real money on a first copy should do this step. If a seller refuses to name the reference, move on.

Tier A: cloned automatic movement

A cloned movement copies the architecture of the original caliber, including jewel count, rotor shape, and beat rate. The seconds hand sweeps the way the genuine watch sweeps, the crown positions feel the same, and the date changes at the right moment.

  • Pros: correct sweep and crown feel, decoration that survives a close look, easier to regulate, better resale within the replica market.
  • Cons: higher cost, fewer sellers stock it, spare parts are scarce, and no clone is a genuine movement.

Use case: the buyer who wears the watch to dinners, meetings, and social events where someone may handle it.

Tier B: generic Asian automatic

This is the common workhorse, either a chronograph module or a simple three-hander. It keeps time and it survives daily wear.

  • Pros: widely available, cheap to replace, easy for any watchmaker to service, robust against knocks.
  • Cons: rotor noise, pusher feel that differs from the original, faster date flip, and rotor engraving that often does not match the genuine layout.

Use case: a travel or weekend watch where you accept the compromise in exchange for durability.

Case and finishing

Look at how the brushed surfaces meet the polished chamfers on the lugs. On a good case, the transition is a crisp line, not a rounded blur. Check the crown guards for symmetry, the case back engraving depth, and whether the serial and reference stamps use the same font as the original.

  • Pros of a well-finished case: correct reflections, correct weight on the wrist, no sharp edges on the lugs.
  • Cons: a bad case cannot be fixed by polishing; the geometry is wrong underneath.

Dial, hands, and crystal

Print thickness is the most common giveaway. Genuine dial text is thin and sharp, with no bleed into the surrounding finish. Check that the hands reach the correct point on the minute track, that the date font matches, and that the lume color is a neutral off-white rather than a green tint. On the crystal, look for a faint blue or purple reflection from anti-reflective coating, and check for a cyclops if the reference uses one.

Bracelet and strap

End links should sit flush against the case with no gap and no rattle. Check the clasp engraving, the taper from the lugs to the clasp, and whether the links are screwed or pin-and-collar. On leather, look at the stitching density and whether the buckle tang matches the case finish.

Water resistance and daily wear

  • Pros: a screw-down case back and crown with fresh gaskets will handle rain, hand washing, and splashes.
  • Cons: replica gaskets are not pressure tested at the factory, and a chronograph pusher is a weak point when wet.

Recommendation: treat any replica as splash resistant at best. Do not swim, dive, or shower with it, no matter what a listing claims.

Red flags in a listing

  1. No reference number, or a number that returns nothing on the manufacturer's site.
  2. Stock photos only, with no image of the actual movement or case back.
  3. A claim of genuine Swiss movement at a price that cannot support one.
  4. Water resistance claims above 50 meters on a replica.
  5. A seller who will not send a short video showing the seconds hand sweep and the date change.

Which tier fits you

Choose Tier A if the watch is a regular part of your rotation and people around you know watches. Choose Tier B if you want the look for casual wear and value easy service over fine detail. If the reference itself turns out not to exist, treat the watch as a design exercise and buy on case quality, dial print, and bracelet fit alone.