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The Encyclopedia of Horology

Movement · Pocket watch movement

American Waltham Watch Co. Riverside Movement

Partially verified

This American Waltham Watch Co. Riverside movement is an antique pocket watch mechanism. The component consists of a circular movement plate displaying gold-toned finishes with visible engraving on the main plate, which states "A.W.W. Co. Riverside WALTHAM, MASS." and identifies the movement as having an "ADJUSTED" designation. It also features a safety pinion. The dial is white with black Roman numerals and a subsidiary seconds dial positioned at the six o'clock mark. The movement is serial numbered 4268087 on the plate. According to the auction description, the movement is reported to be running by the consignor. The object is presented as an individual movement stripped from its original housing. It measures approximately 1.75 inches in diameter as indicated by the photographic reference scale. The item is offered as an antique watch movement with no associated case or accessories included in the lot.

The serial number visible in the photograph is 4268087, not 4280887.
The serial number visible in the photograph is 4268087, not 4280887. — Pasadena Auction House (via Invaluable). Rights pending — permission not yet requested. Original source

Catalogue identity

Source
www.invaluable.com
Category
Movement · Pocket watch movement
Maker / attribution
American Waltham Watch Co.
Reference
Not recorded
Catalogue / lot identifier
2019
Source-reported date
Not established
Source-reported place
United States
Source-reported serial
4268087

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 Appearance

The movement is paired with a white dial that displays a traditional layout with Roman numeral hour markers. The dial includes a subsidiary seconds register located at the bottom of the face, characterized by a smaller track with 10-second increments.

The hands are finished in black. The dial surface is marked with the brand name 'American Waltham W. Co.' below the twelve o'clock position.

Evidence for this section
  • “features Roman numerals on a pristine white dial with black hands”

Movement and Technical Details

The movement plate is finished in a gilt style, with the main plate featuring decorative patterns. The inscription 'A.W.W. Co. Riverside WALTHAM, MASS.' is engraved prominently on the plate along with the designation 'ADJUSTED'.

The mechanical design incorporates a safety pinion, a feature specifically identified in the markings on the movement bridge. The serial number 4268087 is engraved into the metal, appearing clearly in the photographic documentation.

Evidence for this section
  • “The movement is engraved with "A.W.W. Co. Riverside Waltham, Mass.”
  • “It includes a safety pinion”
  • “The serial number is 4280887”

Condition and Attribution

The auction description reports that the movement is in running condition, although this information is provided directly by the consignor.

The item is catalogued as an antique American Waltham Watch Co. movement.

Evidence for this section
  • “is running according to the consigner”
  • “The serial number is 4280887, indicating the movement’s authenticity and place in Waltham’s extensive watchmaking history.”

Open research questions

  • What is the specific production year associated with serial number 4268087?
  • To what calibre or size grade does this specific Riverside movement belong?

Source evidence

Recorded claims and source quotations for American Waltham Watch Co. Riverside Movement
FieldSource-reported valueSource quotation
MakerAmerican Waltham Watch Co.“American Waltham Watch Co. Riverside Movement”
ConditionRunning (unverified)“It includes a safety pinion and is running according to the consigner.”
InscriptionA.W.W. Co. Riverside Waltham, Mass.“A.W.W. Co. Riverside Waltham, Mass.”
Dial FeaturesRoman numerals“features Roman numerals on a pristine white dial”
Lot ID2019“Lot 2019”

Visible details

  • The movement plate is signed 'A.W.W. Co. Riverside WALTHAM, MASS.'
  • The serial number 4268087 is engraved on the main plate.
  • The dial features black Roman numerals and a subsidiary seconds register.
  • A safety pinion is indicated on the plate.

Research qualifications

  • The movement is offered 'as is' and internal condition remains unverified.
  • Functionality is based on unverified consignor reports rather than professional testing.

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

Consulted source

American Waltham Watch Co. Riverside Movement

Reviewed 2026-10-26 · Record 1417645c73

Terms in this record

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

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