Short answer
IW938105 does not appear in IWC Schaffhausen reference lists that are public. IWC reference numbers use the format IW plus six digits. The 93xxxx block is not documented in the brand's published catalogs. A listing that carries IW938105 is a seller code, a misread case number, or a number written to look official. Treat the watch as unidentified until the seller can name the model, the case size, the movement, and the year of production.
Why a code like IW938105 shows up
Three cases cover most listings.
- Digits copied from an engraving that is worn or stamped off center. A single misread digit moves the number into a block that does not exist.
- A code invented by a reseller to group mixed stock. These codes often have six digits and start with IW to look like factory numbering.
- A counterfeit caseback. Makers of replica watches copy the shape of a real caseback and print a number that sounds correct. The number is not tied to any real production run.
The last case is the one buyers run into. A counterfeit caseback can carry a clean engraving, correct font, and a reference that no IWC service center can match to a movement or a parts list. Papers and boxes do not fix this. IWC service centers verify a watch by case number and movement, not by the card in the box.
How to check any IWC reference number
- Write the full number from the caseback, including IW and all six digits.
- Compare it with the model name in the listing. A real reference maps to one model line.
- Ask for the case number, which is separate from the reference. Genuine watches carry both.
- Send the reference and case number to an IWC boutique or service center and ask for a match.
- Request service history. A genuine IWC can be traced through prior service records.
Signs reported on counterfeit IWCs
- Case thickness off by 1 mm to 2 mm from the factory figure.
- Date wheel font and alignment that differ from the genuine dial.
- Rotor engraving with uneven depth or a missing serial.
- Sapphire crystal with a purple or blue tint under a lamp.
- Water resistance that is claimed but not tested. A 100 m rating on a replica case is a claim, not a result.
- No serviceable movement. Many counterfeits use a generic automatic or quartz movement with no spare parts supply.
Legal status in the United States
Counterfeit watches are prohibited merchandise. US Customs and Border Protection can seize and destroy shipments of goods that carry a counterfeit trademark. Trafficking in counterfeit goods is a criminal offense under 19 U.S.C. 2320, and civil claims can follow under the Lanham Act. A private seller who ships a fake IWC into the US takes on that risk, and a buyer can lose the watch and the money paid. Customs seizures are documented each year in CBP reports.
Cost and resale
A replica sells for a small share of the genuine price. It also has no resale market and no service path. Genuine IWC watches hold value through documented service and matching numbers. A watch with an unmatched reference such as IW938105 has neither. If the seller cannot name the model, assume the watch cannot be authenticated and price it at zero.