For a suspected fake IW323773, the top pick is a hands-on authentication at an IWC authorized service center. That option checks the watch against five criteria: caseback engraving and serial logic, dial printing and hand finish, movement construction and case machining, documentation, and seller conduct. The sections below explain what each check can prove, where it falls short, and when to walk away.

Authorized service center authentication

An IWC service center can open the case, identify the movement, compare the case and caseback to factory records, and confirm whether the reference IW323773 matches the serial number on file. This is the closest thing to a final answer.

• Pros: Direct access to manufacturer records and genuine parts. Movement and case are examined by trained watchmakers. A written service estimate gives you a document to show a seller or platform.
• Cons: You may pay a diagnostic fee. Turnaround can take weeks. Some centers require an appointment or shipment, which adds risk if the watch is not yet yours.

Use-case recommendation: Choose this for any private sale above your comfort threshold, for watches with no service history, and for deals where the seller resists a boutique meeting.

Caseback and serial number inspection

The caseback of a genuine IW323773 should carry the reference, a serial number, and engraving that matches IWC's font depth and spacing. Replica makers often get the reference right but miss the serial format, the hallmarks, or the crispness of the laser cut.

• Pros: Free and fast. Can be done from clear photos. A mismatched reference or a serial that appears on multiple listings is an immediate red flag.
• Cons: Modern fakes copy caseback text with surprising accuracy. A clean engraving alone does not prove origin, because public databases and seller photos cannot confirm factory records.

Use-case recommendation: Use this as a first filter before you travel or pay a deposit. If the caseback looks wrong, stop. If it looks right, treat it as a maybe, not a yes.

Dial, hands, and date wheel

Dial printing is where many fakes fail. Check the logo, the brand name, the reference text, and the minute track under magnification. Look at the hands under angled light: genuine hands have polished bevels and clean edges. If the reference has a date, the date wheel should sit centered in the window and change at midnight with a crisp snap.

• Pros: Visible in high-resolution photos. Font weight, spacing, and alignment errors are common on replicas. A loupe or macro lens reveals most printing flaws.
• Cons: Camera angle, glare, and compression hide defects. Genuine dials and hands can be fitted to replica cases, so a correct dial does not prove the whole watch.

Use-case recommendation: Use this check when you are comparing two candidates or when the seller only provides photos. Ask for a straight-on dial shot, a macro of the logo, and a video of the date changing.

Movement and case finishing

The movement is the hardest part to copy. A watchmaker can identify the caliber, check the finishing on bridges and rotor, and see whether the case interior shows the machining marks expected from IWC. Case lugs, crown action, and case finishing also matter. A crown that grinds is a warning.

• Pros: Strong evidence of origin. Reveals swapped or low-grade movements. Case interior and gasket condition give clues about prior service.
• Cons: Requires opening the case, which can affect water resistance if not resealed. You need a trusted watchmaker or service center. Some sellers refuse to allow an opening.

Use-case recommendation: Reserve this step for watches you already intend to buy, or make it a condition of sale. If the seller will not permit an inspection, assume the worst and move on.

Documentation, box, and seller conduct

Papers, boxes, and hang tags are easy to fake and easy to buy separately. Use them as supporting evidence, not proof. Seller conduct matters more: a real owner can explain the purchase, service history, and why the watch is for sale. A seller who pushes a wire transfer, avoids a boutique meeting, or refuses to share a serial photo is a problem.

• Pros: A complete set with matching serials adds confidence. A seller who agrees to an in-person inspection at a boutique or service center is a strong positive signal.
• Cons: Boxes and papers are widely counterfeited. A perfect set can be assembled around a fake watch. Remote sellers can disappear after payment.

Use-case recommendation: For any remote deal, combine this check with a service center authentication and use a payment method with buyer protection. If the seller will not meet at an IWC boutique or authorized service center, walk away.