Date: February 12, 2017
Caliber 19.73 was manufactured for 15 or 20 years starting about 1898. While the basic caliber remained the same, there were variations over the years.
Unable to find either a Longines factory part number or an official part description.
Side View showing broken spring.
Top view of another movement showing the complete spring.
MMagnified portion of the image above.
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