While this guide covers the basics, the official contains critical details you won’t find elsewhere:
If you cannot locate the caliber number:
Pull the crown to the second click and rotate to set the time, paying attention to AM/PM. citizen eco drive gn4ws12g manual link
(e.g., E870, H800). It is often part of a longer hyphenated string, like "E870-S123456". The first four characters are what you need. Model Number
The watch should begin ticking normally. You can now pull the crown out again to set your correct local time and date. While this guide covers the basics, the official
: While "GN-4W-S" is a common reference for several Promaster and vintage automatic models, the Eco-Drive version often uses the E210 movement . Essential Handling Instructions INSTRUCTION MANUAL - CITIZEN WATCH Global Network
The model number (GN-4WS-12G) refers to the case and bracelet style. Citizen organizes manuals by movement caliber . Look closely at your watch dial or case back for a number like Cal. 8635 . Use that for the manual search. The first four characters are what you need
Eco-Drive watches use light to generate energy and require specific handling to ensure long-term performance. CITIZEN WATCH Global Network Setting Instructions - Citizen Watch
: Enter this 4-character code on the Citizen Setting Instructions page .