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Shanghai Watch Factory Caliber SS1

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Manufacturer Shanghai Watch Factory (上海)
Caliber Number SS1, SS1A, SS-1, SS-1A
Based On
Shanghai A581
Jewels 17
Beats per hour 18,000 vph
Power Reserve 40 hours
Anti-Shock System None
Hand-Windable? Yes
Hacking Seconds? Yes
Functions Hours, minutes, central seconds
Country of Manufacture China
Known Models
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The Shanghai caliber SS1 (also written as SS-1) is a 17 jewels (17 zuan) manual wind mechanical movement. It is based off of the original Shanghai caliber A581 (which evolved into the A611). This caliber was produced from circa 1966 – 1972.

There will be two letters above the caliber number. This is the date code for when the movement was manufactured.

There is a similar movement in this family known as the SS1K which beats at a higher 21,600 bph.

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