Image: Early balance spring watch by Thomas Tompion

Description: Early balance spring pocket watch in silver case made by Thomas Tompion, Fleet Street, London. The watch features an unusual dial showing minutes on the main dial and two subsidiary dials for the hours (in the upper position) and seconds (in the lower position). The subsidiary dial for hours indicates up to six hours in each cycle. This watch is one of the earliest surviving watches with a balance spring.
Title: Early balance spring watch by Thomas Tompion
Credit: https://collection.sciencemuseumgroup.org.uk/objects/co33/early-balance-spring-watch-by-thomas-tompion-pocket-watch
Author: Thomas Tompion
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