Calibre 2025 Eco-Drive Perpetual Calendar. The citizen calibre 3100 line has a few notable features making it very easy to live with. The citizen calibre 3100 is a work of genius like no other.

The citizen calibre 3100 is a work of genius like no other. However its appeal extends beyond looks, equipped with perpetual calendar technology requiring setting only once to provide infinitely dependable presentation of day, date and month.