Identifying and authenticating a Casio watch is generally more straightforward than with many mechanical watch brands, thanks to Casio's systematic model numbering. The model reference number and module number on the case back can typically be verified against Casio's official databases and user manual archives. A genuine Casio should have matching module and model numbers that correspond to a known product.
For G-Shock watches, which are among the most commonly counterfeited Casio products, key authentication points often include the quality of the case construction, the clarity and alignment of markings, the quality of the LCD display (for digital models), and the overall heft and feel of the watch. Genuine G-Shock watches are known for their robust construction and precise assembly, and counterfeits often fall short in these areas. The quality of the light and backlight function is also commonly checked.
Other indicators of authenticity include the quality of the printed manual (if included), the packaging, and the warranty card or documentation. The serial number or code on the case back should be cleanly applied. Online verification tools and comparison guides maintained by the G-Shock collector community can be valuable resources. For significant purchases, buying from authorized retailers is the most reliable way to ensure authenticity.