Short answer
A replica IW329045 suits daily wear if you treat it as a style piece rather than a dive tool. The original reference sits in the IWC Aquatimer family: a 42 mm steel case, an internal rotating bezel driven by a second crown at 4 o'clock, a depth rating near 300 m and an automatic calibre inside. A first copy carries the same silhouette and dial layout, but not the same movement or seals. Wear it on land and through light water contact, and it will last for years.
What the reference gets right on the original
The Aquatimer line is IWC's dive family. The 42 mm automatic keeps its timing scale under the crystal, turned by the lower crown, so the bezel cannot be knocked out of position. Luminous markers sit on a matte dial, and the case back is solid. Those are the details a first copy has to match before anything else matters. If the lower crown does not turn, or the minute track sits at the wrong angle, the watch reads as a copy from arm's length.
How to check a first copy IW329045 before you pay
- Measure the case across the bezel without the crowns. It should land near 42 mm, and the lug width should be close to 22 mm so standard straps fit.
- Turn the crown at 4 o'clock through a full rotation. It must move in smooth steps with no grinding and no free spin.
- Press the outer bezel edge. The scale on the original is set by the crown only, so a freely rotating outer ring is a mismatch.
- Inspect the dial printing with a loupe. The brand wordmark should be level, evenly spaced and free of thick edges.
- Set the date and wind the crown. A clean jump at midnight with light resistance points to a decent movement, while a slow crawl points to a cheap one.
- Ask for a water resistance test result if the seller claims one. Most first copies handle splashes only, whatever the case back says.
- Check the crystal for coating. Sapphire with an inner anti-reflective layer gives a dark, clear look, while mineral glass reflects room light.
Daily wear setup
- Fit a rubber or sailcloth strap for warm months. Leather on a dive watch swells and cracks with sweat.
- Size the bracelet with a little slide at the wrist. A 42 mm case plus a loose bracelet swings into the case back and scuffs it.
- Reset the inner scale to zero before you wear the watch, so it lines up with the minute hand at the top.
- Rinse the case with fresh water after pool or sea contact, then dry it with a soft cloth.
Care and limits
Keep the watch out of showers, hot tubs and diving. Heat and chlorine attack gaskets, and a first copy usually carries thinner seals than the original. Have the gaskets checked once a year if you swim in it. A movement of this type runs about 38 to 42 hours on a full wind, so wear it or wind it every other day to keep time. Service the movement when it drifts more than a minute a day.