The pick that suits most buyers is a stainless-steel automatic first copy of the IW329107 with a matte or sunburst dial, sharp printed markers, a sapphire crystal, and a movement the seller can name on paper. That pick wins on four checks: how the case is machined and finished, how the dial reads at arm's length, what runs inside the case, and how the strap and buckle hold up after a month. The sections below walk those checks in order and end with a version recommendation for daily wear, office wear, and weekend wear.
What the IW329107 reference is, and what a first copy actually copies
The reference belongs to IWC's Pilot's Watch family, which means the design brief is instrument work: a clean dial, high contrast, and hands you can read at a glance. Reference numbers inside one pilot family can differ in case size, dial color, date layout, and strap, so confirm the exact original data you care about from IWC's own documentation before you judge any copy against it. A replica maker builds in layers. The case and bezel come first because they set the silhouette. The dial and hands come second because they set the read. The movement comes last, and it is usually where cost gets cut.
Criterion 1: Case shape and finishing
Look at the case profile from the side. A good first copy keeps the lugs thin, the bezel flat, and the transition from brushed top surfaces to polished flanks clean. Run a fingernail along the lug edges. Sharp burrs mean the case was finished in a hurry.
- Pros of a well-finished case: sits flat on the wrist, takes a strap without scratching, holds a brushed surface that hides daily marks.
- Cons of a cheap case: thick lugs that lift the watch off the wrist, uneven brushing, a crown that wobbles when you set the time.
Recommendation: pick a 316L stainless steel case with a screw-down crown if you plan to wear the watch near water, and ask which water resistance rating the build follows, since ISO 22810 defines how those ratings are tested.
Criterion 2: Dial, hands, and lume
Pilot dials live or die on contrast. Check that the markers are evenly spaced, that the 12 o'clock triangle lines up with the crown, and that the hand stack sits level under the crystal. Lume is the fastest tell. Charge the dial under a lamp for thirty seconds, then step into a dark room. Weak lume fades in minutes and often shows a patchy, greenish cast.
- Pros of a strong dial: crisp text, a date window that aligns with the chapter ring, lume that glows evenly across markers and hands.
- Cons of a weak dial: printed text that thickens under magnification, a misaligned date, hands that scrape the dial when tapped.
Recommendation: choose this build if legibility is the reason you want the watch. Skip it if the listing photos are cropped tight and never show the dial at an angle.
Criterion 3: The movement
Ask the seller for the movement name and, for automatics, the power reserve figure. Japanese automatic movements are the safer daily choice because parts and servicing are easy to find. Quartz builds cost less and hold time better, but they lose the sweeping seconds hand that pilot watch buyers usually want.
- Pros of a named automatic: serviceable, hackable on better grades, holds time within a few seconds a day after regulation.
- Cons of an unnamed automatic: no spare parts, no service path, and a rotor that rattles against the caseback.
Recommendation: buy the automatic for daily wear, and buy quartz only if you want a low-cost second watch for travel.
Criterion 4: Crystal, strap, and hardware
Sapphire crystal resists scratches and keeps the dial readable for years. Mineral glass picks up fine swirls within weeks. On the strap side, check the stitching density, the leather thickness at the lugs, and whether the buckle tang sits centered.
- Pros of sapphire plus a quality strap: clear dial at every angle, a strap that softens instead of cracking, a buckle that does not chew the leather.
- Cons of mineral plus a thin strap: hazy reflections, stretched holes, plating that wears through to bare metal at the buckle.
Recommendation: pair a sapphire build with a second strap in a different color so the watch covers both office and weekend use.
Before you pay: a short checklist
- Ask for the case diameter, lug width, and thickness in millimeters.
- Request photos of the caseback, crown, and buckle, not just the dial.
- Confirm the movement name and the water resistance rating.
- Ask about the return window and whether the strap is included.
- Check the seller's history for buyers who posted their own photos.
Which version fits your use
Daily wear
Steel case, dark dial, sapphire crystal, Japanese automatic, and a leather strap you can replace. This is the build that survives a commute, a desk, and a weekend.
Office and dress-leaning wear
Slimmer case, sunburst dial, no date, and a thin calf strap. Fewer features mean fewer places for a first copy to look wrong.
Travel and beater duty
Quartz movement, mineral crystal if the price is right, and a nylon strap. Accept the trade-offs and keep the money for a better automatic later.