The (also known as Module 3721) is a specialized solar-powered, radio-controlled movement found in vintage and mid-2000s timepieces, most notably the Oceanus OCW-100TLJ and the Casio Wave Ceptor series. This module is celebrated among enthusiasts for its "set it and forget it" reliability, combining light-charging technology with atomic time synchronization. Core Features of the 3721 Module Casio 3721 Go to product viewer dialog for this item.
: Includes a bright LED light with an Auto Light feature that activates when you tilt your wrist toward your face. casio 3721
If your specific issue isn't covered here, look up the "Casio 3721 User Manual" (Official document #3721) for button-press sequence diagrams. The (also known as Module 3721) is a
The module 3721 is physically interchangeable with: : Includes a bright LED light with an
When enthusiasts refer to the "Casio 3721," they are referring to . This is the specific electronic engine that drives the watch. This module was utilized in some of Casio’s most beloved "Double Finder" and analog-digital hybrid models in the late 1990s and early 2000s.
In the vast and sprawling universe of horology, few names command as much universal recognition as Casio. From the playground to the battlefield, and from the office boardroom to the summit of Everest, Casio timepieces have cemented their status as indispensable tools. Among the myriad of module numbers and model designations that collectors and enthusiasts discuss, the term frequently surfaces.
The 3721 is often associated with Casio's "Double Finder" branding. This refers to the dual display windows on the watch face. This layout was revolutionary for information density. The user could view the current time while simultaneously running a stopwatch or checking a second time zone without having to cycle through modes on a single screen. This efficiency is a hallmark of the 3721 architecture.