The Casio module 3721 is a reliable, no-frills analog-digital movement best known for powering the AQ-230 series. Its strengths are battery efficiency, classic styling, and functional simplicity. Its main weakness is the lack of water resistance. For casual or office use, it remains an excellent value.
Technically, Casio still produces the 3721 module, as it continues to manufacture the GA-100 series. However, the GA-100 is slowly being phased out in favor of newer, solar-powered (Tough Solar) and Bluetooth modules (like the 5593 or 5601).
This is the 3721’s party trick. When you enter Stopwatch Mode, the analog hands freeze (to save power) and the digital display takes over. casio 3721
If you have a watch with a , you own a piece of late-2000s design history. It represents the peak of "chunky" G-Shock design before the trend shifted toward thinner, carbon-core watches.
: Includes a bright LED light with an Auto Light feature that activates when you tilt your wrist toward your face. The Casio module 3721 is a reliable, no-frills
"If you become confused and lose your way... simply put the watch down and do not perform any button operation for two or three minutes" to let it reset to timekeeping mode. Is it Worth it? Solar & Atomic : Set it once (via signal) and it's maintenance-free. Manual Nightmare
: The face acts as a solar cell, converting light into electricity stored in a rechargeable battery. For casual or office use, it remains an excellent value
Casio Module 3721 (most notably used in the Casio Overland OVW-100TDJ
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.