Clock · Master clock

Synchronome Master Clock with Seconds Pilot Dial

Partially verified

According to auction cataloguing, this Synchronome master clock is housed in a slim mahogany case with a long glazed door, standing 128 cm high. The clock encloses a 7-inch silvered pilot dial featuring Arabic numerals and a red central seconds hand. The source reports that the dial fronts a Synchronome seconds impulse movement bearing NRA number 4144. The accompanying photograph displays the rear of the pilot dial assembly, highlighting a brass plate framework, toothed wheels, adjustment thumbscrews, an electromagnetic coil wound with copper wire, and cloth-insulated electrical lead wiring.

Rear view of the dial mechanism showing electromagnetic coil, brass gearing, and electrical contacts — Hutchinson Scott Limited. Rights pending — permission not yet requested. Original source

Catalogue identity

Source: www.invaluable.com
Category: Clock · Master clock
Maker / attribution: Synchronome
Reference: Not recorded
Catalogue / lot identifier: 2
Source-reported date: Not established
Country: United Kingdom
Source-reported serial: 4144

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 and Dial Configuration

According to the auction cataloguing, the master clock is housed in a "slim mahogany case with along glazed door" measuring 128 cm high. It encloses a "7\" silvered 'pilot' dial with Arabic numerals and rare red hand central seconds".

The case exterior and the face of the dial are not visible in the provided reference photograph, which depicts only the rear assembly of the dial and movement.

Evidence for this section

“the slim mahogany case with along glazed door enclosing a 7" silvered 'pilot' dial with Arabic numerals and rare red hand central seconds”
“128cm high”

Pilot Movement and Visible Electromechanics

The auction description notes that the dial fronts a "Synchronome seconds impulse movement and a rare NRA number 4144".

Visual examination of the mechanism rear shows a circular brass sub-plate mounted to a larger dark circular bezel or dial backing. Electromechanical elements include a single horizontal electromagnetic coil wrapped with fine copper wire secured with aged tape, alongside toothed brass wheels and lever arms mounted between shaped brass plates with steel screws. Braided cloth-insulated wiring connects to electrical terminal contacts on the left side, and threaded adjustment thumbscrews with knurled heads are fitted on the right side of the brass framing.

Evidence for this section

“fronting a Synchronome seconds impulse movement and a rare NRA number 4144”
“Circular brass sub-plate mounted to a larger dark circular bezel or dial backing”
“Single horizontal electromagnetic coil wrapped with fine copper wire secured with aged tape”
“Toothed brass wheels and lever arms mounted between shaped brass plates with steel screws”
“Braided cloth-insulated wiring attached to electrical terminal contacts on the left side”
“Threaded adjustment thumbscrews with knurled heads on the right side of the brass framing”

Visual Limits and Unverified Elements

The photograph is restricted to a close-up rear view of the dial mechanism. The case, pendulum, dial front, and overall layout are not depicted.

Operational condition, electrical functionality, and coil continuity are not established by the visual evidence. Additionally, the reported "NRA number 4144" is not legible in the provided photograph.

Evidence for this section

“Circular brass sub-plate mounted to a larger dark circular bezel or dial backing”
“fronting a Synchronome seconds impulse movement and a rare NRA number 4144”

Open research questions

Where on the clock or movement is the designation 'NRA number 4144' stamped or engraved?
Is the pendulum and master contact switchgear present and intact within the mahogany case?
What institutional or administrative body is represented by the 'NRA' mark on Synchronome master clock installations?

Source evidence

Recorded claims and source quotations for Synchronome Master Clock with Seconds Pilot Dial
Field	Source-reported value	Source quotation
Case material	Mahogany	“the slim mahogany case with along glazed door”
Dial description	7-inch silvered pilot dial with Arabic numerals and red central seconds hand	“a 7" silvered 'pilot' dial with Arabic numerals and rare red hand central seconds”
Movement	Synchronome seconds impulse movement	“fronting a Synchronome seconds impulse movement”
Identification number	NRA 4144	“a rare NRA number 4144”
Height	128 cm	“128cm high”
Movement description	Synchronome seconds impulse movement with NRA number 4144	“fronting a Synchronome seconds impulse movement and a rare NRA number 4144”

Visible details

Circular brass sub-plate mounted to a larger dark circular bezel or dial backing
Single horizontal electromagnetic coil wrapped with fine copper wire secured with aged tape
Toothed brass wheels and lever arms mounted between shaped brass plates with steel screws
Braided cloth-insulated wiring attached to electrical terminal contacts on the left side
Threaded adjustment thumbscrews with knurled heads on the right side of the brass framing

Research qualifications

The overall mahogany longcase and the front of the 7-inch pilot dial are not depicted in this photograph
Operating condition, electrical functionality, and completeness cannot be determined from the image
Maker attribution and NRA serial/identification number are source-reported and not directly legible in the image

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

Consulted source

Sold at Auction: A SYNCHRONOME MASTER CLOCK WITH SECONDS PILOT DIAL

Reviewed 2026-10-21 · Record 94af609d36

Terms in this record

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

Bezel