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The Encyclopedia of Horology

Clock · Cockpit clock

Nero Lemania 7510 8-Day Aircraft Cockpit Clock

Partially verified

This military aircraft cockpit clock by Nero Lemania is housed in a powder-coated aluminium square instrument case with mounting holes. It features a matte black dial marked with bold white quarter Arabic numerals at 12, 3, 6, and 9, luminous sword-style hands, a central seconds hand, and an outer minute track. Inscribed '8DAYS' and 'NERO LEMANIA', the timepiece is source-reported to be powered by a manual-wind 15-jewel Lemania caliber 7510 mechanical movement providing an 8-day power reserve. The seller reports military markings 6A/4339520 and 1830/58 on the reverse.

Front view of the Nero Lemania cockpit clock showing black dial, quarter Arabic numerals, and bottom-left control knob
Front view of the Nero Lemania cockpit clock showing black dial, quarter Arabic numerals, and bottom-left control knob — Vintage Watch Specialist. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
vintagewatchspecialist.com
Category
Clock · Cockpit clock
Maker / attribution
Lemania
Reference
6A/4339520
Catalogue / lot identifier
vws2054
Source-reported date
circa 1958
Country
Switzerland
Source-reported serial
3231360

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

Construction and Exterior

The timepiece is housed in a powder-coated aluminium case. The design features a recessed circular bezel and visible mounting bushings at the diagonal corners.

The matte black dial includes painted white Arabic numerals at the 12, 3, 6, and 9 o'clock positions, with an outer minute track. It is signed 'NERO LEMANIA' below the 12 o'clock mark and '8DAYS' above the 6 o'clock mark, with 'SWISS MADE' at the lower edge. The hardware includes sword-style hour and minute hands alongside a central seconds hand.

Evidence for this section
  • “Made from Case: Powder Coated Aluminium”
  • “Dial signed 'NERO LEMANIA' under 12, '8DAYS' above 6, and tiny 'SWISS MADE' along the lower edge”
  • “Square black flange case with recessed circular bezel and visible mounting bushings at diagonal corners”
  • “White sword-shaped hour and minute hands accompanied by a slender center seconds hand”

Mechanism and Technical Specifications

The clock utilizes a 15-jewel Lemania caliber 7510 mechanical movement with a manual-wind system. The movement is specified as an 8-day clock, requiring winding once per week.

The movement is recorded with the serial number 3231360, and the inside of the case is marked 'INCA 1515903'.

Evidence for this section
  • “Caliber: Lemania 7510”
  • “Jewels: 15j”
  • “Power reserve: 8 days”
  • “The movement is marked - 3231360 and the inside case is marked INCA 1515903.”

Military Markings and Documentation

The reverse of the case bears the military markings '6A/4339520' and '1830/58'. The piece is dated by the source to circa 1958.

The clock includes MoD Form 731 documentation. The seller reports that this form refers to the timepiece as 'ex bulldog', noting a potential association with the Scottish Aviation Bulldog aircraft fleet.

Evidence for this section
  • “boasting military markings 6A/4339520 1830/58 to the reverse”
  • “this clock does have some military service documentation in the shape of a MoD Form 731, (see images), which refers to it as being 'ex bulldog'”
  • “Date of issue: c.1958”

Open research questions

  • What is the specific historical significance of the 'INCA 1515903' mark found on the internal case?
  • Can the MoD Form 731 reference 'ex bulldog' be verified against official military maintenance or inventory logs for the Scottish Aviation Bulldog?

Source evidence

Recorded claims and source quotations for Nero Lemania 7510 8-Day Aircraft Cockpit Clock
FieldSource-reported valueSource quotation
CaliberLemania 7510“Caliber: Lemania 7510”
Jewels15j“Jewels: 15j”
Power Reserve8 days“Power reserve: 8 days”
Military Markings6A/4339520 1830/58“boasting military markings 6A/4339520 1830/58 to the reverse”
Movement Number3231360“The movement is marked - 3231360”
Movement Serial3231360“The movement is marked - 3231360”
Internal Case MarkINCA 1515903“the inside case is marked INCA 1515903”
Reference6A/4339520“military markings 6A/4339520 1830/58”

Visible details

  • Square black flange case with recessed circular bezel and visible mounting bushings at diagonal corners
  • Prominent cylindrical winding/setting knob situated at the lower left of the bezel
  • Matte black dial with painted white Arabic numerals at 12, 3, 6, and 9, triangle index at 12, and bold minute batons
  • Dial signed 'NERO LEMANIA' under 12, '8DAYS' above 6, and tiny 'SWISS MADE' along the lower edge
  • White sword-shaped hour and minute hands accompanied by a slender center seconds hand

Research qualifications

  • Movement number 3231360 and caliber 7510 details are source-reported and not visible in the primary exterior image
  • Case back military markings 6A/4339520 and 1830/58 are obscured from the front view
  • Association with Scottish Aviation Bulldog aircraft rests on accompanying MoD Form 731 documentation reported by the seller

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

Consulted source

Nero Lemania 7510 - 8 Day Aircraft Cockpit Clock - Dated 1958 - Origin – Vintage Watch Specialist

Reviewed 2026-10-21 · Record 72537989df

Terms in this record

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