Citizen Promaster – Diver Eco-Drive 37mm

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The Citizen Promaster EO2020-08E, EO2021-05L, EO2023-00A, and EO2028-06L watches belong to the compact 37mm Promaster Dive range, designed to combine performance, reliability, and style. Powered by the E168 Eco-Drive caliber, they operate using light and do not require a battery.

Each is water-resistant to 200 meters, meeting ISO standards for dive watches, with a unidirectional bezel, a screw-down crown at 4 o'clock, and a 36.5 mm steel case. Their main differences lie in the dials, colors, and straps:

• EO2020-08E: black dial with orange luminescent hands and markers.
• EO2021-05L: version with blue dial and orange minute hand (mentioned in Citizen ads)
• EO2023-00A: silver dial, silver gold case, pink strap — softer/feminine color.
• EO2028-06L: blue dial, light blue strap, steel case, same diving technical characteristics.
• These models offer a more compact alternative to classic dive watches, while maintaining the performance standards characteristic of the Promaster line.

Common technical characteristics

• Movement: Citizen Eco-Drive caliber E168 (±15 sec/month)
• Power reserve: approximately 180 days (standby mode)
• Case: stainless steel, silver finish
• Diameter: 36.5 mm
• Thickness: ~11 mm (varies depending on version)
• Glass: Crystal glass (reinforced mineral glass)
• Water resistance: 200 m / 20 ATM
• Bracelet: polyurethane / matching rubber strap
• Width between lugs: 18 mm
• Functions: hours, minutes, seconds + date
• Glasses: unidirectional
• Crown: screwed down at 4 o'clock for greater comfort on the wrist