Citizen Eco-Drive Corso Multi-Function Ref. BU2010-57L
Casual/Sport Multi-Function · Citizen (Citizen Watch Co., Ltd.). Located in the 'Mid-Range/Affordable' tier, known for pioneering solar technology.
Period: Modern Luxury Utility (2010s-Present). It features a contemporary oversized 'Genta-inspired' integrated aesthetic with a emphasis on sustainable light-powered technology.
Type
Casual/Sport Multi-Function
Brand
Citizen (Citizen Watch Co., Ltd.). Located in the 'Mid-Range/Affordable' tier, known for pioneering solar technology.
Movement
Citizen Eco-Drive Solar-Powered Quartz, Caliber 8723. Features approximately 6 months of power reserve on a full charge and ±15 seconds per month accuracy.
Dimensions
44mm case diameter, 13mm thickness, 50mm lug-to-lug, 22mm integrated lug width.
Description
An essential daily-wear watch, the BU2010-57L combines the convenience of solar charging with a classic 'Day-Date' layout that mimics the look of a chronograph without the complexity. Its deep blue dial provides excellent legibility and a touch of sportiness.
Key Features
Eco-Drive technology (never needs a battery), dual sub-dial analog calendar, and the high-contrast silver-on-blue color scheme.
Dial Description
Sunray navy blue dial with a concentric ring texture on the outer chapter ring. Features applied baton indices and two large sub-dials at 3 (date) and 9 (day of the week) o'clock. Baton hands with luminous fill.
Case Material
Stainless steel (316L) with a mix of brushed surfaces on the lugs and bracelet, and a polished fixed bezel.
Crystal Type
Flat Mineral Crystal. This is standard for this price tier but more prone to scratches than sapphire.
Bezel Details
Fixed, polished stainless steel bezel with a thin, refined profile to maximize dial real estate.
Crown & Pushers
Standard push-pull crown at 3 o'clock, unguarded, with a knurled texture for grip.
Bracelet or Strap
Three-link stainless steel 'Oyster' style bracelet with a push-button fold-over clasp and safety bar.
Caseback Details
Solid screw-down caseback containing the Eco-Drive logo, caliber number, and water resistance specifications.
Movement Type
Citizen Eco-Drive Solar-Powered Quartz, Caliber 8723. Features approximately 6 months of power reserve on a full charge and ±15 seconds per month accuracy.
Water Resistance
100 Meters (10 ATM). Suitable for swimming and snorkeling, but not recommended for high-impact water sports or diving due to the non-locking crown.
Origin & Provenance
Japanese Movement, assembled in Thailand or China (standard for international Citizen models). Movement is fully in-house developed by Citizen.
Age Estimate
Circa 2015-2022. This specific design language is a staple of Citizen's Corso and Chandler collections from the last decade.
Cultural Significance
Represents the shift in the 21st century toward sustainable watchmaking, moving away from disposable silver-oxide batteries.
Condition Notes
Fair to Good. Visible desk diving scratches on the bracelet and bezel consistent with frequent wear. The crystal appears clear but may have micro-abrasions typical of mineral glass.
Value Estimate
MSRP: $325. Used/Secondary Market: $100 - $160 depending on condition and inclusion of original links.
Care & Maintenance
Avoid leaving in a dark drawer for more than 3 months. Clean the bracelet with a soft brush and water to prevent 'wrist cheese.' No battery changes required, but gaskets should be checked every 5 years.
Similar Watches
Seiko SNE Series (Solar), Tissot Gentleman (Quartz), or Casio Edifice Solar. The Seiko offers similar reliability but often lacks the specific sub-dial layout of this Citizen.
Interesting Facts
The Eco-Drive system is so efficient it can be charged by indoor fluorescent lighting, not just sunlight, and can run in total darkness for months.