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The watch that winds itself
... John Harwood, a watchmaker from the Isle of Man, set about developing different winding and setting mechanisms located inside the watch in order to dispense with the need of an opening in the watch case for the winding stem. In 1924, he was awarded a Swiss patent for a movement relying on a pivoted oscillating weight that moved to and from through an arc of 270° hitting buffer spring on both sides, ...
Case 18kt yellow gold, snap-on back.
Movement Caliber AS, self-winding, 23.4 mm, 15 jewels, hammer winding in one direction, cut bimetallic balance, flat hairspring, 18,000 vibrations per hour.