Quick answer
A replica IW323766 is an aftermarket copy of an IWC dive watch reference in the Aquatimer family. Build quality is not uniform across sellers. Two watches pulled from the same listing photos can differ in case thickness, bezel action, dial print, and bracelet fit. Judge the piece on the parts you can measure and handle, not on the model number in the title.
What the reference looks like on paper
The original is a steel sports dive watch with a screw-down crown, a rotating dive bezel, a sapphire crystal, and a dial built for low light. Replicas aim to match the case profile, lug shape, and dial layout. Most miss in three places: crystal height above the bezel, the sharpness of the lug bevels, and the spacing of the text on the dial. Under 10x magnification those gaps show up fast.
Before you shop
- Know the target case diameter and thickness, and ask the seller for caliper photos.
- Decide on a movement type: Asian automatic, Japanese automatic, Swiss-labelled clone, or quartz.
- Set a budget band. Price tiers map to case finishing, not to the logo on the dial.
- Get the return window and payment method confirmed in writing.
Inspection steps
- Measure case diameter, thickness, and lug width with calipers, then compare them to the numbers you were quoted.
- Rotate the bezel through a full turn. It should click at even intervals with no back play.
- Check bezel alignment at 12. The marker should sit centered over the dial index.
- Unscrew and reseat the crown. Threads should engage without grit or cross-threading.
- Inspect the dial at arm's length first, then under a loupe, looking for bleeding print, crooked markers, and dust under the crystal.
- Charge the lume under light for 30 seconds, then compare brightness and decay between the hands and the hour markers.
- Test the date change. It should snap over, not creep, and it should not flip inside the 9 pm to 3 am window.
- Run the watch for 24 hours and note the rate against a time signal. Anything past +20 seconds per day needs regulation.
- Flex the bracelet and pull each link. Check for side shake and loose end links at the lugs.
- Have a watchmaker pressure test the case. Do not water test at home.
Movement choices
An automatic movement gives the correct sweep and the correct caseback profile. A Miyota or Seiko-based automatic is the sensible middle ground. Swiss-labelled clones cost more and offer no visible benefit behind a solid caseback. Quartz keeps better time for less money, but the seconds hand ticks, which is an immediate tell on a dive watch whose original has a sweeping hand.
Red flags
- Stock photos only, with no in-hand images next to a dated card.
- A seller who refuses caliper or movement photos.
- Weight quoted far below 130 grams for a steel dive watch on a full bracelet.
- Gold plating claimed on a reference that was never offered in gold.
- Water resistance claims above 200 m with no test report.
Ownership notes
Gaskets are the weak point on any replica. Have them replaced and the case pressure tested every 12 months if you swim with the watch. Keep the crown screwed down and rinse the case in fresh water after salt exposure. Store it off the crown and wind it once a month when it sits unworn.