Look at the back of your watch for a string like XXXX-XXXXXXX . The first four characters (e.g., E870, H800, B877) are your movement number.
The marking indicates the watch's water resistance and case construction standards rather than its internal functionality. Most watches with this marking are standard analog Eco-Drive models, which typically follow these basic operations:
If you own the Citizen Eco-Drive GN4-W S12G or are considering one, this complete guide will help you understand setup, daily use, features, maintenance, and troubleshooting — plus where to find the official manual.
To download your specific manual, visit the Citizen Watch Setting Instructions Page and enter your caliber number.