Buy the replica IW329087 by matching the case, not the sales copy. The reference belongs to the IWC Aquatimer Automatic 42 family, an internal-bezel dive watch, so the tells sit in four places: case thickness, the second crown at 2 o'clock, dial print, and lume. Ask for timestamped photos of the exact unit you will receive, confirm roughly 42 mm across and about 14 mm thick, and insist on a short video of the inner bezel turning. A seller who cannot produce those three things is a poor risk, however the listing describes its grade.

Know the reference before you compare versions

The genuine watch uses a stainless steel case of about 42 mm with a matte black dial, applied markers, a date window at 3 o'clock, sapphire crystal, and a 300 m depth rating. Its party piece is the internal rotating dive bezel, driven by a crown at 2 o'clock rather than a bezel you turn by hand. That single detail separates a serious replica from a generic dive watch with an Aquatimer dial glued on.

Movement is where replicas diverge most. The original runs an in-house caliber with a long power reserve. Copies use Miyota 9015, Seiko NH35, or a clone of an ETA 2824-2, none of which will match a five-day reserve. Treat any claim about power reserve on a replica as marketing, and judge the watch on feel, finishing, and timekeeping instead.

What to look for in a replica IW329087

• Case profile. The mid-case should have a soft curve into the lugs, not a flat slab. Look at the watch side-on in the photos.
• Bezel crown. The 2 o'clock crown should sit flush, turn with firm detents, and move the inner ring with no lag or backlash.
• Dial print. The brand text and depth rating should be thin, level, and fully legible under magnification. Thick, blobby print is the fastest tell.
• Applied markers. They should be polished on the sides, flat on top, and set at a consistent height.
• Lume. Ask for a dark-room shot. Even, warm-green glow across all markers beats a bright patchy glow.
• Bracelet or strap fit. End links should sit tight to the case with no gap at the lug line, and the clasp should close with a solid click.
• Weight. A steel 42 mm dive watch on a bracelet carries real heft. A hollow, tinny feel points to folded links or a thin case.

Parameter bands to check

• Case diameter: 41.8 to 42.2 mm. A 40 mm or 44 mm case is a different reference.
• Case thickness: 13.8 to 14.4 mm. Thin copies lose the dive watch stance.
• Lug width: 22 mm. Confirm this before buying an extra strap.
• Crystal: sapphire with anti-reflective coating, mild blue or colorless tint, no rainbow haze.
• Bezel action: 60 detents, unidirectional, no free play when locked.
• Movement options: Miyota 9015 and Seagull movements sit at the dependable end, Asian 2824 clones at the repairable end.
• Water resistance: assume none unless the case back gasket and crown seals are shown, and never dive with a replica.

Where replicas of this reference usually fail

1. The inner bezel is decorative. It turns, but the ring drifts and the triangle never lines up at 12.
2. The 2 o'clock crown is a dummy. Cheaper builds fix it in place and rely on buyers never testing it.
3. Case thickness is off by a full millimeter, which throws off the bracelet fit and the watch's balance on the wrist.
4. Dial text sits too close to the rehaut, or the date window is cut with rounded, soft corners.
5. Stock photos instead of real ones. If every image is a press render, you are buying a promise, not a watch.

Questions buyers ask

How do I confirm the seller has the actual watch?

Request a photo with today's date written on paper next to the dial, plus a short clip of the bezel crown turning. Sellers who handle stock answer within a day. Sellers who drop-ship stall or send a render.

Is a more expensive tier always better?

No. Price tracks finishing and movement, not accuracy to the reference. Compare photos of the dial and case profile across tiers and pick the one whose proportions look right.

Can I wear it swimming?

Skip it. Replica seals are not tested to the rated depth, and a leak writes off the watch. Rinse and dry after any contact with water.

Does a replica hold value?

No. Treat the spend as a consumable, buy from a seller with a return window, and keep the listing terms in writing.

A replica is not a genuine IWC and cannot be sold or presented as one. Buy it as a lookalike, disclose it if you resell, and keep your expectations on finish rather than provenance.