Top pick: a high-grade replica of the IW323791 that matches the genuine case profile to within a fraction of a millimeter, runs an automatic movement with a correct sweep, and prints the dial cleanly. That is the short answer. This guide judges every replica tier on five checks you can run yourself with a caliper, a loupe, and a phone camera: case dimensions, dial and hand detail, movement type, water resistance, and seller support. Reputation and price come after those checks, not before.

Start with the reference, not the listing

The reference number tells you which case, which material, and which bracelet combination the genuine watch uses. Pull the official specification for the IW323791 and write down four figures: case diameter, case thickness, lug width, and water resistance rating. Then compare those figures with what the seller publishes. Replica listings often copy the brand numbers rather than measuring the watch in the box. Measure on arrival. If the case is off by more than half a millimeter, the bracelet will not sit right and the lugs will look wrong next to the genuine piece.

  • Checks that hold up: published dimensions match the brand spec sheet, crown position lines up with the case flank, lug holes drilled at the correct height.
  • What to watch: sellers who list one diameter for several references, photos borrowed from the brand site, or measurements given in ranges.

Best for buyers who own or have handled the genuine watch, because side-by-side comparison catches the small errors that photos hide.

Case and bracelet finishing

Look at three zones: the brushed top of the lugs, the polished bevel between them, and the transition at the crown guards. A good replica keeps the brush lines straight and the bevel edge sharp. A weak one polishes over the bevel or leaves the brush running in two directions on the same lug. On the bracelet, check the end link fit. A gap you can see from arm's length is the most common giveaway.

  • Pros of a high-grade case: correct brushing direction, tight end links, crisp bevels that catch light the way the genuine watch does.
  • Cons of a high-grade case: higher price, longer wait from most sellers, fewer ready-to-ship options.
  • Pros of an entry case: low cost, fast shipping, easy to replace if damaged.
  • Cons of an entry case: soft edges, visible end link gaps, finish that wears at the clasp within months.

Dial, hands, and date

Print quality separates tiers faster than anything else. Photograph the dial at 2x and compare the logo, the reference text, and the minute track. Genuine dials use applied markers with polished edges; replicas usually print or glue them. Check the date window alignment, the font on the date wheel, and whether the hands are the right length. A second hand that stops short of the minute track is a quick tell.

  • Pros: applied markers, correct fonts, and clean lume application make the watch readable and convincing in normal wear.
  • Cons: misaligned date wheels, flat printed markers, and mismatched lume color between hands and dial.

Movement

Ask what is inside before you ask the price. Replica movements fall into three broad groups: decorated clones of common Swiss designs, unbranded Asian automatics, and genuine Swiss movements dropped into a replica case. The third group costs the most and is the easiest to verify, because a watchmaker can open the back and identify it. Beat rate is a simple check. A 28,800 vph movement sweeps eight times per second; a 21,600 vph movement sweeps six. Listen, or film it in slow motion.

  • Pros of a genuine Swiss movement: serviceable in most cities, stable timekeeping, identifiable parts.
  • Cons: highest cost, and it does not fix a bad case or dial.
  • Pros of a clone movement: lower price, usually keeps time well when new, parts come from the same sellers.
  • Cons of a clone movement: uneven quality control, harder to service, rotor noise on cheaper examples.

Water resistance and finishing checks

Water resistance is the claim most likely to be wrong. A rating stamped on a caseback means nothing without a gasket test. ISO 22810 sets the conditions for marking a watch water resistant, and no replica seller runs that test unless they say so. Treat any replica as splash resistant until a watchmaker pressure tests it. Separately, check the crown thread, the caseback engraving depth, and the clasp marking.

  • Pros: a seller who offers a pressure test result or accepts a return after one is worth the premium.
  • Cons: listings that quote the genuine rating with no test, and screw-down crowns that cross-thread after a few uses.

Which option fits your use

For a daily wearer that sees rain and desk work, a mid-tier build with a clone automatic and a pressure test is the sensible pick. If you plan to compare the watch against a genuine piece, or wear it around people who handle IWC watches, pay for the top case and dial tier and accept the cost. If you want a travel watch you can lose without regret, the entry tier does that job, and the flaws will not matter at arm's length. In every case, buy from a seller who publishes measurements, answers movement questions in writing, and accepts returns. Those three terms matter more than any photo set.