The British Masters in Timekeeping: A Pictorial

Part 4 of 4 – Tompion Alarm GMT

by Michael Sandler


Case / Dial

Case Composition: 18K red gold, three parts
Crystal/Bezel: Domed, sapphire
Crown: Dual crowns, first sets all functions except alarm, second sets alarm
Caseback: Secured by 6 screws
Water Resistance: 160 feet
Diameter: 40.5 millimeters
Thickness: 14.5 millimeters
Hands: 18K red gold hour, minute and second hands, blued steel second time zone indicator


Calibre: Tompion No. T.671, automatic winding
Functions: Hours, minutes, seconds, alarm, second time zone, date
Power Reserve: approx. 45 hours
Diameter: 30.0 millimeters
Thickness: 6.50 millimeters
Frequency: 28,800 alternations per hour
Components: Incabloc shock protection, glucydur balance, 31 jewels, two spring chambers
Misc: Cotes de Geneve decorated, adjusted to five positions
Note: I have contacted the distributor for this watch to request more information on the movement used in this watch. The based movement has been purported to be of Girard Perregaux or A. Schild origin (or both). I have also requested information as to the specifics of the plate type balance spring.


Release Year: 1997
Retail Price: US$ 12,900

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