How to Spot a Fake Casio — The Universal Method
Module number
Every genuine Casio has a 4-digit module number on the caseback — it identifies the movement family and is the single fastest authenticity screen. Wrong module for the reference = instant fail. Key ones: 593 (F-91W), 1545 (DW-5600), 5637 (GA-2100), 1330 (A158/A168).
Packaging logic
Real boxes print the exact model and the barcodes match it; manuals are module-specific. Generic manuals, handwritten model numbers, or a box for a different variant are counterfeit markers.
Warranty paperwork
Genuine stock carries region-matched warranty cards with printed (not handwritten) model fields. A "US warranty" card in Asian-market packaging is the classic mix-and-match fake setup.
Price sanity
Genuine branded watches have a hard wholesale floor — that's why small-quantity prices cluster tightly. An offer 30-40% below the going range isn't cheaper supply; it's the reason. Price-vs-paperwork coherence is the strongest single signal.
The three-way match: the professional receiving check
On any delivery — a single watch or a thousand-unit lot — the trade runs one boring, decisive check: carton packing list ↔ unit caseback codes ↔ box labels, all naming the same reference. Ten minutes per pallet. It catches substitutions, shortages and mix-ups while they're still free to fix, and it works at miniature scale for an individual buyer: one watch, one box, one card — all three should agree.
Model-specific guides
The universal layers above work on any reference. For the three most-counterfeited families, we maintain dedicated checks with model-specific details: the F-91W four-point check, the GA-2100 CasiOak six tells, and the DW-5600 square checks.
What to do when a check fails
Stop, document, don't confront. Photograph the failing evidence, preserve the packaging, and take it up with the seller or platform while the paper trail is intact. For bulk deliveries, a failed check inside the claim window converts directly into replacement or credit — the mechanics are in our bulk QC guide.
More verification guides
Buying stock and want it verified before shipping?
Every JOJO WATCH WHOLESALE order ships with model-labelled cartons, packing lists and pre-shipment photos — verified with exactly the checks in this guide.
Get a Verified Wholesale Quote