The replica IW371762 worth your money is a 42 mm Pilot's Watch Chronograph build running an automatic Asia 7750, with the day-date at 3, small seconds at 9, and chronograph counters at 12 and 6. Those four positions are the whole test. The reference is powered by a 7750-derived caliber, so a competent copy can match the dial layout instead of faking it with dead subdials. The criteria below are the ones that decide whether a listing is a real 3717 copy or a generic pilot chronograph with the right number pasted into the title: movement type, case size, dial printing, crystal coating, and the honest limits of ownership.

What the IW371762 reference actually is

IW371762 belongs to IWC's 3717 family, the 42 mm Pilot's Watch Chronograph sold through the 2000s and powered by caliber 79320, an ETA/Valjoux 7750 base with a day-date window at 3. The dial runs small seconds at 9, a 30-minute chronograph counter at 12 and a 12-hour counter at 6, with luminous numerals and a soft-iron inner case for magnetic shielding.

Sellers blur families, so check the number against the photos. A 3717 case measures 42 mm. The later 43 mm pilot chronographs are a different family with a different dial layout. If a listing measures 43 mm across, or spreads the subdials in a pattern the 3717 never used, the reference number in the title is decoration. Dial color, strap or bracelet, and the last two digits of the reference all move together, so confirm which variant the photos show before you compare anything else.

Criterion 1: movement

Movement choice decides how the watch feels on day one and how long it stays wearable.

Pros

  • An Asian 7750 copies the same architecture as the reference caliber, so the subdials land in the correct places rather than being printed on a solid plate.
  • Chronograph start, stop and reset work, and the pushers feel like pushers.
  • Automatic winding plus a true day-date at 3 means the watch behaves like the original in daily rotation.

Cons

  • The 7750 rotor and chronograph works are louder than a modern in-house caliber, and the wobble is noticeable on the wrist.
  • Servicing is the weak point. A movement that arrives running badly is usually cheaper to replace than to repair.
  • Quartz and decorative movements show up in cheap listings as a seconds hand that jumps or a subdial hand that never moves.

Use case: if you want the look and will rarely touch the chronograph, an Asia 7750 is the sensible tier. If you plan to time things often or keep the watch for years, factor a movement swap into the decision before you buy.

Criterion 2: case and dimensions

Case work is where most pilot chronograph copies give themselves away in the hand, even when the photos look right.

Pros

  • A 42 mm case is easy to reproduce, so dimensions usually land close to the reference.
  • The brushed bezel and case top with polished flanks is a simple finish to copy well at this price level.
  • The solid caseback hides the movement, which means no display window has to be justified.

Cons

  • Thickness runs heavy on cheaper builds, and the extra height shows up under a cuff.
  • Crown and pusher finishing is often left sharp, and the crown engraving can be shallow or absent.
  • Spring bars, caseback threads and gaskets vary by batch, so two watches from the same listing can differ.

Use case: ask for a photo of the case next to a ruler or calipers. A seller who only posts studio renders and refuses a measurement shot is telling you something about the build.

Criterion 3: dial, printing and lume

At 42 mm the dial is large, so printing errors are visible from arm's length.

Pros

  • Applied luminous numerals and a clean matte or sunburst finish are achievable at mid and upper tiers.
  • Correct day-date font is common enough that you can find it without paying the top tier.
  • Lume on the numerals, hands and the marker at 12 can match in color and glow.

Cons

  • Subdial hands that do not zero at the reset position are a sign of careless assembly.
  • Date and day wheels sometimes sit slightly low or high in the window.
  • Wordmark spacing and the placement of the text under 12 are the first tells a collector checks.

Use case: request one straight-on dial photo and one in daylight. If the subdial hands are off zero in the product shots, they will be off on your wrist.

Criterion 4: crystal and finishing details

Glass and small hardware decide whether the watch photographs like the reference or like a copy.

Pros

  • Sapphire with internal anti-reflective coating is available and turns the dial black rather than gray.
  • Caseback engraving can be deep and legible on the better builds.
  • Bracelet or strap hardware copies the reference clasp shape closely.

Cons

  • Single-sided coating throws a blue or purple cast across the dial in daylight.
  • Mineral glass scratches and lacks the crisp edge of sapphire.
  • Stiff straps and sharp clasp edges are the most common complaints after delivery.

Use case: if you wear the watch under a sleeve most of the day, coating matters less. If you photograph it or wear short sleeves, avoid the strong blue reflections.

Who should buy a replica IW371762

Pros

  • The 3717 family layout is simple, which means a good copy looks correct to almost everyone who is not holding the original.
  • Replacement straps are easy to source, so you can fix the weakest part of the package cheaply.
  • Service parts for the 7750 architecture are widely available, even if the replica itself is not.

Cons

  • Water resistance is not guaranteed. Treat it as splash proof at best and keep it out of the pool.
  • No manufacturer support, no warranty worth the paper, and resale value close to zero.
  • None of them will pass a close inspection by someone who knows the reference.

Use case: this is a watch for someone who wants the pilot chronograph look at a fraction of the cost and accepts that it is a wearable object, not an investment or a swim companion. If you need genuine water resistance, service history or resale, buy the real thing or a well documented alternative.