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The Encyclopedia of Horology

Wristwatch · Calendar wristwatch

Citizen Corso Eco-Drive Calendar Wristwatch Ref. BU2010-57L

Partially verified

This is a pre-owned Citizen Corso Eco-Drive calendar wristwatch, reference BU2010-57L. According to the seller, it was made in Japan and is housed in a 44 mm stainless steel round case with a matching bracelet and fold-over push-button clasp. The watch is powered by Citizen's light-driven Eco-Drive quartz movement, caliber 8729, featuring central seconds. The blue dial includes silver-tone hands with luminous inserts, applied hour markers, an outer minute and second chapter, and three sub-dials showing the day of the week at 9 o'clock, date at 3 o'clock, and 24-hour time at 6 o'clock.

Dial and case front of the Citizen Corso Eco-Drive calendar wristwatch Ref. BU2010-57L
Dial and case front of the Citizen Corso Eco-Drive calendar wristwatch Ref. BU2010-57L — SECOND HAND HOROLOGY. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
secondhandhorology.com
Category
Wristwatch · Calendar wristwatch
Maker / attribution
Citizen
Reference
BU2010-57L
Catalogue / lot identifier
WA-4189
Source-reported date
Not established
Country
Japan
Source-reported serial
471020502

Source-reported attribution and specifications are not independent authentication. A listing does not establish present ownership, current display, availability or permission to reproduce.

Object description

Dial and Display Configuration

The watch features a sunburst blue dial with silver-tone hour markers, luminous accents, and white minute/second tracks, fitted with silver-tone luminous matching hands. The dial is signed 'CITIZEN' at the top and marked 'Eco-Drive' on the lower register.

The display incorporates three subsidiary dials: day of the week at 9 o'clock, date at 3 o'clock, and a 12/24-hour sub-dial located at the 6 o'clock position. The hands include matching luminous baton hands paired with a central seconds hand bearing an open circular counterweight.

Evidence for this section
  • “Sunburst blue dial signed CITIZEN below 12 o'clock and Eco-Drive on the lower register”
  • “Blue dial with silver-tone hour marks, luminous accents, white minute/second tracks and silver luminous matching hands.”
  • “Three auxiliary dials positioned at 3 o'clock (date), 6 o'clock (24-hour indication), and 9 o'clock (day of the week)”
  • “Silver-tone luminescent baton hour and minute hands with skeletonized circular counterweights”

Case and Bracelet Construction

The watch is cased in a 44 mm round stainless steel case, measuring 46 mm including the crown, 50.7 mm lug-to-lug, and 12.5 mm in thickness. It features a lug width and band width of 23 mm and is fitted with crystal glass. The case carries a stated water-resistance rating of WR100M/10BAR/333ft.

It is paired with an original silver-tone stainless steel bracelet signed Citizen, featuring a fold-over push-button clasp. The seller notes the bracelet accommodates a wrist size up to 8 1/4 inches (21 cm).

Evidence for this section
  • “Cased in 44mm round case, all in stainless steel.”
  • “Measurements (mm): Case 44 Case w/Crown 46 Case Lug to Lug 50.7 Case Thickness 12.5 Lug Width 23 Band Width 23”
  • “Crystal glass.”
  • “Water-resistance WR100M/10BAR/333ft.”
  • “Original silver-tone stainless steel bracelet signed Citizen with fold over clasp with push button. It will fit a wrist up to 8 1/4" (21 cm).”

Movement and Inscriptions

The wristwatch is powered by a light-driven quartz Eco-Drive movement, caliber 8729, featuring a central seconds hand, overcharge prevention function, and insufficient charge warning function. The seller documents the watch as being made in Japan.

The case back markings, which are documented by the seller but not visually verifiable in the single provided front dial photograph, are reported as 'Citizen Watch Co. CITIZEN Eco-Drive W.R. 10BAR Mov'T Japan GN-4W-S ST. Steel 471020502 8729-S093015'.

Evidence for this section
  • “Powered by Eco-Drive movement caliber 8729 with central second hand, featuring three sub-dials: date, weekday and 12- and 24-hour times, insufficient charge warning function, overcharge prevention function.”
  • “Made in Japan.”
  • “Case Markings: Citizen Watch Co. CITIZEN Eco-Drive W.R. 10BAR Mov'T Japan GN-4W-S ST. Steel 471020502 8729-S093015”

Open research questions

  • Can direct photography of the case back be obtained to visually confirm the engraved case markings, model code 8729-S093015, and serial number 471020502?
  • Can the manufacturing date of this specific example be determined based on the Citizen serial number 471020502?
  • Does the 'Crystal glass' specified in the vendor listing represent standard mineral glass or sapphire crystal?

Source evidence

Recorded claims and source quotations for Citizen Corso Eco-Drive Calendar Wristwatch Ref. BU2010-57L
FieldSource-reported valueSource quotation
ReferenceBU2010-57L“Ref. BU2010-57L”
Movement CaliberCaliber 8729“Powered by Eco-Drive movement caliber 8729”
Case Serial Number471020502“471020502”
Case Markings8729-S093015“8729-S093015”
Case Diameter44 mm“Cased in 44mm round case, all in stainless steel.”
Water ResistanceWR100M / 10 BAR / 333 ft“Water-resistance WR100M/10BAR/333ft.”
Lug to Lug Measurement50.7 mm“Case Lug to Lug 50.7”
Lug Width / Band Width23 mm“Lug Width 23 Band Width 23”
Crystal MaterialCrystal glass“Crystal glass.”

Visible details

  • Sunburst blue dial signed CITIZEN below 12 o'clock and Eco-Drive on the lower register
  • Three auxiliary dials positioned at 3 o'clock (date), 6 o'clock (24-hour indication), and 9 o'clock (day of the week)
  • Silver-tone luminescent baton hour and minute hands with skeletonized circular counterweights
  • Outer sloped rehaut printed with Arabic numerals at five-minute intervals
  • Polished and brushed stainless steel round case with fluted crown at 3 o'clock and integrated multi-link steel bracelet

Research qualifications

  • Case back inscriptions and serial number are reported by the source seller but not visually verifiable in the provided single dial photograph.
  • Exact date of manufacture is not specified.

Photograph identity and source facts were screened before import; rights clearance remains pending.

Consulted source

CITIZEN Corso Watch Ref. BU2010-57L Eco-Drive Calendar Wristwatch – SECOND HAND HOROLOGY

Reviewed 2026-10-21 · Record 59aaf27afd

Terms in this record

Glossary explanations for terms named in this object’s record.

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