: Based on similar models, your watch might use the E820 (perpetual calendar) or H804 (radio-controlled) movements. 📖 Step 2: Access the Official Manual
: While it doesn't need standard batteries, the rechargeable cell typically lasts 10–20 years before needing professional service (Citizen Support). How to Set Your Citizen Eco-Drive citizen eco drive gn-4w-s-12g manual
If you have misplaced the paper manual, follow these steps. You will need a small pointed tool (like a paperclip) or a ballpoint pen. : Based on similar models, your watch might