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The Encyclopedia of Horology

Clock · Atmos clock

Le Coultre Atmos Perpetual Motion Clock

Partially verified

This vintage Le Coultre Atmos perpetual motion clock features a brass and glass case housing a mechanical movement visible through the open dial center. The auction source records movement serial number 399090 along with the inscription 'Fifteen 15 Jewels VXN Switzerland Unadjusted.' The front features a white chapter ring with Arabic numerals at 3, 6, 9, and 12 alternating with dagger markers, labeled 'ATMOS' and 'SWISS MADE'. Beneath the dial mechanism, the signature rotating balance is visible. Dimensions reported by the source are 9 inches high by 7.5 inches wide by 5.5 inches deep.

Front view of Le Coultre Atmos brass and glass clock showing dial and torsion pendulum
Front view of Le Coultre Atmos brass and glass clock showing dial and torsion pendulum — Auctions at Showplace. Rights pending — permission not yet requested. Original source

Catalogue identity

Source
www.bidsquare.com
Category
Clock · Atmos clock
Maker / attribution
Le Coultre
Reference
Not recorded
Catalogue / lot identifier
280
Source-reported date
Not established
Country
Switzerland
Source-reported serial
399090

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

Case Construction

This timepiece is housed in a glazed brass case featuring canted corners. A top-mounted locking lever mechanism secures the structure.

The clock measures approximately 9 inches in height, 7.5 inches in width, and 5.5 inches in depth.

Evidence for this section
  • “Glazed brass case with canted corners and top-mounted locking lever mechanism.”
  • “9" H x 7.5" W x 5.5" D.”

Dial and Dial-Side Features

The dial features a white chapter ring inscribed with 'ATMOS' and 'SWISS MADE.' It incorporates applied gilt Arabic numerals at the 3, 6, 9, and 12 positions, which alternate with dart-shaped hour markers.

The design includes an open center, exposing the movement gears and the front center arbor for visual inspection.

Evidence for this section
  • “White chapter ring with applied gilt Arabic numerals at 3, 6, 9, and 12 and dart-shaped hour markers.”
  • “Open center exposing movement gears and front center arbor.”

Mechanism and Pendulum

A large cylindrical balance with vertical grooves is suspended beneath the dial framework and positioned above the stepped base.

The movement is identified by the serial number 399090 and is inscribed with the movement specifications: 'Fifteen 15 Jewels VXN Switzerland Unadjusted.'

Evidence for this section
  • “Large cylindrical balance with vertical grooves suspended beneath the dial framework above the stepped base.”
  • “number 399090”
  • “marked: "Fifteen 15 Jewels VXN Switzerland Unadjusted."”

Open research questions

  • Does the serial number 399090 align with specific production years according to Le Coultre Atmos production records?
  • What is the specific model or version classification for a clock featuring this dial configuration and case style?

Source evidence

Recorded claims and source quotations for Le Coultre Atmos Perpetual Motion Clock
FieldSource-reported valueSource quotation
MakerLe Coultre“Le Coultre vintage Atmos perpetual motion brass and glass clock”
Serial Number399090“number 399090”
Movement InscriptionFifteen 15 Jewels VXN Switzerland Unadjusted“marked: "Fifteen 15 Jewels VXN Switzerland Unadjusted."”
Dimensions9" H x 7.5" W x 5.5" D“9" H x 7.5" W x 5.5" D.”

Visible details

  • Glazed brass case with canted corners and top-mounted locking lever mechanism.
  • White chapter ring with applied gilt Arabic numerals at 3, 6, 9, and 12 and dart-shaped hour markers.
  • Open center exposing movement gears and front center arbor.
  • Large cylindrical balance with vertical grooves suspended beneath the dial framework above the stepped base.

Research qualifications

  • Operating condition, bellows function, and timekeeping accuracy are not tested or reported.
  • Movement serial stamp and reverse bellows assembly are not visible in the provided photograph.

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

Consulted source

Le Coultre Atmos Perpetual Motion Clock sold at auction on 17th January | Bidsquare

Reviewed 2026-10-21 · Record 0637e26fb1

Terms in this record

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