Overview of Citizen Calibers 2810–2880

This document covers a range of analog quartz movements from Citizen. These calibers are known for their slim profiles, efficient power usage, and variety of functional configurations. While all models share core quartz timekeeping technology, each caliber series offers distinct features to accommodate various watch designs.

Key Caliber Groups and Their Features

2810A, 2813A, 2818A

• Center second hand

• Date indication

• Power cell life indicator

• Thickness: 2.2 mm

2820A, 2823A, 2828A

• No center second

• Power saving switch only

• Ultra-slim design

• Thickness: 1.9 mm

2830A to 2838A

• Center second hand

• No calendar

• Minimal complication configuration

• Thickness: 1.9 mm

2840A

• Center second hand

• World time indication

• Thickness: 2.6 mm

2850A to 2858A

• Center second hand

• Day and date indication

• Quick setting for both calendar functions

• Power cell life indicator

• Thickness: 2.5–3.0 mm

2860A to 2868A

• Center second hand

• Date indication

• Power saving switch

• Thickness: 2.5 mm

2870A, 2875A

• Center second hand

• Day indication by hand

• 2870A includes moon age display (accuracy ±0.18 day/year)

• Thickness: 2.7 mm

2880A

• Center second hand

• Day and date with quick setting

• Thickness: 3.0 mm

Dimensions

Most movements feature case dimensions of approximately 23.7 mm × 21.7 mm, with thickness varying by caliber. These compact dimensions make them suitable for a wide range of slim analog quartz watches.

Common Internal Components

• Power cell connectors and straps (Type I & II)

• Coil units (e.g., part #102 or #123)

• Electronic circuit units (e.g., #374, #551, or #548)

• Setting stems, yokes, levers, and other stem assembly parts

Notable Features Across Calibers

• World time function (exclusive to 2840A)

• Moon phase and day hand indication (2870A)

• Day hand display (2870A and 2875A)

• Power cell life indicators on most calendar-equipped models

• Power saving switches present in nearly all movements