The Citizen Men's Calibre 3100 Perpetual Calendar Watch BT0000-07E is big, bold and smart with a two-window date display.

It also benefits from Citizen Eco-Drive technology, which draws energy from any light source so you will never need to buy a replacement battery.

• Calibre 3100 Twin Date Collection
• Perpetual calendar automatically adjusts for odd/even months and leap years to 2100
• Eco-Drive technology charges in sunlight or indoors so no batteries to replace
• Black dial with silver-tone luminous hands and markers
• Solid stainless steel case
• Black leather strap with push-button deployment clasp
• 12/24-hour time
• Large date display
• Low charge indicator
• Time reset advisory
• Screw-back case
• Non-reflective scratch-resistant mineral crystal
• Water resistance 100 m
• Case dimensions: 41 (W) x 11 (D) mm