Chelsea Airplane or Automotive Clock. Antique Chelsea brass-cased desk or pocket clock, retailed by Smith Patterson Co. Boston, featuring Arabic numerals, a top seconds sub-dial, a slow/fast regulation slot, and an accompanying brass winding key.

Size: 3 1/4 x 3 1/4 x 2 1/2 in. 

Chelsea Clock has been producing high-quality American clocks since 1897 and is especially renowned for its precision marine clocks and ship's bells. Founded in Chelsea, the company earned a reputation for exceptional craftsmanship by supplying durable, accurate timepieces to the United States Navy, commercial vessels, and private yachts. Chelsea clocks are distinguished by their solid brass cases, finely engineered mechanical movements, and classic nautical styling, with many models still handcrafted and assembled in the United States. Their combination of reliability, elegance, and maritime heritage has made both vintage and modern Chelsea clocks highly prized by collectors, sailors, and anyone who appreciates fine American horology.

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