The Chelsea Clock Company was founded in 1897 in Chelsea, Massachusetts. They supplied clocks to the US Navy and Air Force during the twentieth century. They sold matching barometers for their marine clocks. The barometer movements were made by the French manufacturer Naudet (identified by the HBPN logo) and were also supplied by Selsi. They remain in business today for clock production and repair.

From 1959, a catalog from Chelsea showing their clocks and matching barometers is available below (28 pages):

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