Kembery Antique Clocks Ltd has dated this piece to the 1900s.
A high quality 8-day duration mechanism.

E. Howard & Co. Boston were famous for high grade regulators, watches and marine clocks. They are noted as perhaps the finest marine clock makers ever made in America. They supplied clocks to the U.S. Navy and this example dates to circa 1900.
Width (of bezel ) 8" / 20cms
Kembery Antique Clocks Ltd has dated this piece to the 1900s.
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