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The Encyclopedia of Horology

Wristwatch · Flyback chronograph wristwatch

A. Lange & Söhne Ref. 405.031 Datograph Up/Down Wristwatch

Partially verified

This A. Lange & Söhne Datograph Up/Down reference 405.031 is an 18K pink gold flyback chronograph wristwatch dating to circa 2016. According to the auction catalogue, it features a 41mm case housing the manual-wind calibre L.951.6 movement with 46 jewels. The black dial presents an oversized double date display beneath 12 o'clock, subsidiary dials for running seconds and chronograph minutes, and an Up/Down power reserve indication at 6 o'clock. Accompanied by its stamped guarantee seal dated August 2016, instruction manual, and presentation box, the watch is fitted with a brown crocodile strap and an 18K pink gold deployant clasp.

A. Lange & Söhne Datograph Up/Down wristwatch ref. 405.031 with original guarantee and box
A. Lange & Söhne Datograph Up/Down wristwatch ref. 405.031 with original guarantee and box — Phillips. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
www.phillips.com
Category
Wristwatch · Flyback chronograph wristwatch
Maker / attribution
A. Lange & Söhne
Reference
405.031
Catalogue / lot identifier
956
Source-reported date
Circa 2016
Country
Germany
Source-reported serial
219’484

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

Identity and Case Construction

Catalogued as reference 405.031 and model Datograph Up/Down, this A. Lange & Söhne timepiece is cased in 18K pink gold with a stated diameter of 41mm. The lot listing records case number 219’484 and notes that the case, dial, movement, and clasp are signed by the maker.

The auction entry assigns a date of circa 2016 and lists the watch as 'Property from the Original Owner'. It is fitted to a crocodile strap equipped with an 18K pink gold A. Lange & Söhne deployant clasp.

Evidence for this section
  • “Reference No 405.031”
  • “Model Name Datograph Up/Down”
  • “Material 18K pink gold”
  • “Dimensions 41mm diameter”
  • “Case No 219’484”
  • “Signed Case, dial, movement and clasp signed”
  • “Year Circa 2016”
  • “Property from the Original Owner”
  • “Bracelet/Strap Crocodile”
  • “Clasp/Buckle 18K pink gold A. Lange & Söhne deployant clasp”

Dial Architecture and Display

Direct visual inspection of the front photograph confirms a black dial with baton hour markers and dual light-coloured subsidiary registers for running seconds and chronograph minutes. An oversized double date display window is situated below the 12 o'clock position.

An Up/Down power reserve sub-indicator is located at 6 o'clock, marked with 'AB' and 'AUF'. The auction essay notes that the flyback chronograph configuration allows the mechanism to be reset to zero and restarted in mid-measurement by pressing and releasing the pusher.

Evidence for this section
  • “Black dial with dual light-coloured subsidiary dials and baton hour markers”
  • “Double date display window below the 12 o'clock position”
  • “Power reserve sub-indicator at 6 o'clock marked AB and AUF”
  • “the addition of a power reserve indication at 6 o’clock indicated as “AB” and “AUF” also known as the Up/Down”
  • “the flyback function of the Datograph allows the chronograph to be instantly reset to zero and started again in the midst of an ongoing measurement by simply pushing down the chronograph button”

Mechanism and Accompanying Accessories

The cataloguing identifies the movement as the manual calibre L.951.6 with 46 jewels, bearing movement number 115’598. Although the auction text states the movement can be viewed through a sapphire caseback, the movement and rear case are not visible in the provided primary front photograph.

Accompanying documentation and accessories include an A. Lange & Söhne guarantee stamped by retailer Pro Hopetime Watch Co. Taiwan and dated 6th August 2016, alongside an instruction manual, product literature, leather folio, fitted presentation box, and outer packaging.

Evidence for this section
  • “Movement No 115’598”
  • “Calibre Manual, cal. L.951.6, 46 jewels”
  • “The entire movement can be brilliantly admire through the sapphire caseback”
  • “Accompanied by A. Lange & Söhne guarantee stamped Pro Hopetime Watch Co. Taiwan dated 6th August 2016, instruction manual, product literature, leather folio, fitted presentation box and outer packaging.”

Open research questions

  • What specific hallmarks and caseback reference engravings are visible upon direct physical inspection of the reverse of case 219’484?
  • Are there documented service records or maintenance entries from authorized A. Lange & Söhne service centers between the August 2016 retailer sale date and the auction appearance?

Source evidence

Recorded claims and source quotations for A. Lange & Söhne Ref. 405.031 Datograph Up/Down Wristwatch
FieldSource-reported valueSource quotation
Reference405.031“Reference No 405.031”
Case Number219’484“Case No 219’484”
Movement Number115’598“Movement No 115’598”
CalibreManual, cal. L.951.6, 46 jewels“Calibre Manual, cal. L.951.6, 46 jewels”
Case Material18K pink gold“Material 18K pink gold”
Dimensions41mm diameter“Dimensions 41mm diameter”
Clasp Material and Type18K pink gold deployant clasp“Clasp/Buckle 18K pink gold A. Lange & Söhne deployant clasp”
Guarantee StampPro Hopetime Watch Co. Taiwan, dated 6th August 2016“stamped Pro Hopetime Watch Co. Taiwan dated 6th August 2016”

Visible details

  • Black dial with dual light-coloured subsidiary dials and baton hour markers
  • Double date display window below the 12 o'clock position
  • Power reserve sub-indicator at 6 o'clock marked AB and AUF
  • Accompanied by guarantee paperwork, Datograph manual, and fitted presentation case

Research qualifications

  • Caseback and movement are not visible in the primary front photograph; mechanism details rely on auctioneer descriptions

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

Consulted source

A. Lange & Söhne The Hong Kong Watch Auction: XV

Reviewed 2026-10-21 · Record 01f6e21f15

Terms in this record

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

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