Short answer: IW938103 is almost always listing shorthand for the IWC Pilot's Watch Chronograph 41 family, and the number behind it is usually IW388103, the steel version with the blue dial. IWC's own numbering for that generation sits in the IW3881xx block, so a "938103" string normally comes from a marketplace title, a seller typo, or a catalog re-code rather than from Schaffhausen. If you are shopping a replica carrying that number, you are looking at a copy of a 41mm pilot's chronograph, not a rare limited edition. Treat it as such and you will judge it more clearly.
What the genuine watch is
The reference behind the keyword is a stainless steel pilot's chronograph, 41mm across, roughly 14.5mm thick, with 20mm lugs. The layout is bicompax: a 30 minute counter at 12, running seconds at 6, and a day and date window at 3. Power comes from the IWC caliber 69385, an in-house chronograph with a column wheel and around 46 hours of reserve. The dial is a sunburst blue with applied numerals and lume, and the crystal has a mild anti-reflective treatment that reads clear rather than blue.
Where replicas of this reference fall short
Most of the tells on a fake IW388103 live in the small geometry, not the big shapes. In photos I check these first:
- Subdial spacing and hand length. On the real dial the 12 o'clock counter sits close to the triangle marker. Fakes often push it down a millimeter or two.
- The day and date window. Genuine printing is crisp and centered. Copies show thick fonts, off-center dates, or a day wheel in the wrong language order.
- Case thickness. A 7750-based copy usually runs 15mm or more, which you can spot in a straight side profile shot on a flat surface.
- Crystal tint. Blue or purple AR is a giveaway. The genuine glass is nearly invisible.
- Pusher feel and chrono reset. Genuine pushers have a short, positive throw. Cheap copies feel mushy, and the reset hand snaps back with a visible wobble.
- Caseback engraving and rotor finishing. Deep, sharp lettering on the real thing, shallow laser etching on most copies.
Movements you will actually find
Low tier builds use quartz, which is fine for looks and bad for everything else. Mid tier versions run a modified Asia 7750, and the chronograph action is where the money went. Top tier examples use a better finished 7750 derivative or, less often, a hand wound ST19 in no-date builds. Ask the seller for a video of the chronograph starting, running, and resetting before you pay. Ask for a movement photo with the caseback off. A seller who will not send either is telling you something.
Price bands, roughly
From what I have seen browsing these listings, expect around 80 to 150 dollars at the quartz end, 250 to 450 for a decent 7750 build, and 500 and up for the tier where case finishing, dial printing, and crystal treatment get close. Nothing at any price is the real movement.
Practical notes
Do not swim in it, even if the listing claims 50 meters. Do not sell it as genuine, and do not take it to a boutique for service. A local watchmaker can handle a 7750 service for a reasonable fee, which is worth knowing before you buy. If the keyword you started with was IW938103, verify the actual reference in the listing photos against the IW388103 dial layout before you commit.