The short answer

Buy the replica IW323755 that gets the case profile and the dial right, and treat the movement as the second decision. A correct case outline, crisp applied markers and a date window that sits where it should will read better on the wrist than a decorated rotor nobody sees. Ask for dated photos of the actual unit you will receive, compare case diameter, thickness and lug-to-lug against the published figures for the reference, and pay with a method that leaves you a return window. If a listing shows only factory renders, or the case looks slab-sided and sharp in a video, keep looking.

Confirm the reference before you compare photos

IWC groups a whole family under one number stem, and the trailing digits identify the case metal, dial color and bracelet or strap combination. Two listings that both say IW323755 can therefore show different watches if the seller is sloppy with the code. Pin down the full number, the dial variant and whether the watch ships on a bracelet or a strap, then judge every photo against that exact configuration. A seller who cannot tell you which variant they are holding is a seller who has not handled the watch.

What to look for

Case and finishing

Look at the flank of the case in a side photo. Brushed surfaces should run in one direction with a clean transition into the polished bevels, and the lugs should taper without a step where the machining changed. Sharp lug undersides and a crown that sits proud of the case tube are the two most common tells on this tier of replica. Ask for the measured thickness with a caliper if the seller has one, since a case that is half a millimeter too thick changes how the watch sits under a cuff.

Dial, hands and date

Zoom in hard. Applied indices should have a beveled edge and lume that fills the frame without overflowing. Printing should be black and sharp under magnification, not gray and fuzzy. The date disc is where most copies fall apart: check that the numeral sits centered in the window, that the font weight matches the reference, and that the window has the right bevel or frame. Hands should be flat and cleanly finished, with a seconds hand that reaches the chapter ring instead of stopping short.

Crystal and coating

Sapphire is standard at the better tiers. What varies is the anti-reflective treatment: a proper inner coating kills glare without the purple sheen that cheap outer coatings produce. View the watch at an angle in a photo or video. If the dial goes milky at 45 degrees, the coating is on the outside and will scratch.

Movement

Three options dominate. A Miyota 9015 is thin, reliable and cheap to service, but the rotor is loud and the beat is 28,800 vph. A clone of the ETA 2892 family gives you a thinner movement and a smoother winding feel, and it is the choice most buyers make when the case is slim. A decorated Asian automatic with an engraved bridge looks better through a display back. Ask which movement is inside, ask for a timegrapher photo showing rate and amplitude, and confirm the date changes cleanly at midnight rather than drifting.

Bracelet and clasp

Solid links, screwed pins rather than friction pins, and end links that sit flush against the case with no visible gap. Flex the bracelet in a video: it should articulate smoothly without rattling. The clasp should close with a firm click and the safety catch should engage without slack. If the reference ships on a strap, check that the strap thickness and stitching match, and that the buckle has the correct tang shape.

Crown, caseback and engraving

The crown logo should be crisp and correctly proportioned, not a blob. Caseback engraving on this tier is often shallow, so compare depth and letter spacing against a reference photo. Serial and reference numbers should be consistent between the caseback and the paperwork, even on a copy.

Parameter bands worth checking

• Case diameter: within about 0.5 mm of the published figure.
• Case thickness: within about 0.5 mm, and under 12 mm for a slim sports case.
• Weight: within roughly 10 to 15 grams of the original on a full bracelet.
• Beat rate: 28,800 vph (4 Hz) for any 2892-type movement.
• Power reserve: 38 to 42 hours on a fresh clone; anything under 30 suggests a tired mainspring.
• Rate: within plus or minus 15 seconds a day out of the box is acceptable.
• Steel: 316L is the norm, 904L shows up on premium builds.
• Crystal: sapphire with inner anti-reflective coating on both surfaces.
• Water resistance: treat every replica as splash resistant only, regardless of what the caseback says.

Pitfalls

• Stock photos instead of photos of the actual unit. Always ask for dated, hand-held shots.
• Sellers who promise water resistance for swimming. Gaskets on copies are not tested to the depth printed on the dial.
• Bracelet end links with visible gaps or a step against the case.
• Date wheels that sit high, low or off-center in the window.
• Dial printing that looks gray in daylight rather than black.
• No stated return window, or a return policy that excludes the bracelet once sized.
• Claims of "Swiss made" on a watch that should not carry it.
• Free "gift" boxes used to justify a higher price. Packaging is cheap; the watch is not.

FAQ

How do I verify the movement without opening the case?

Wind it slowly and listen. A 2892-type movement winds with light resistance and a fine click; a Miyota 9015 feels slightly coarser and spins its rotor audibly when you tilt the watch. A timegrapher photo settles the question faster than any description.

Is it worth paying more for a better movement?

Yes, if the case is slim. A thin case with a thick movement forces the builder to compromise on the caseback or the dial height, and that shows. If the case is already correct, spend the money on dial and bracelet quality instead.

Will a jeweler be able to tell?

Under a loupe, often yes. On the wrist, at arm's length, rarely. The details that give a copy away are case thickness, bracelet rattle and date font, so focus your budget there.

Should I have the watch serviced on arrival?

Only if the timegrapher numbers are poor or the date change is sloppy. Otherwise wear it for a few weeks first, since many copies settle in and a service costs a meaningful share of the purchase price.