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Shanghai Watch Factory Caliber SS1K

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ManufacturerShanghai Watch Factory (上海)
Caliber NumberSS1K, SS-1K
Based On
Shanghai SS1
Jewels17
Beats per hour21,600 bph
Power Reserve45 hours
Anti-Shock SystemNone
Hand-Windable?Yes
Hacking Seconds?Yes
FunctionsHours, minutes, central seconds
Country of ManufactureChina
Known Models
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The Shanghai caliber SS1K (also written as SS-1K) 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 introduced in circa 1972 and produced until 1975.

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

Shanghai Caliber SS1K vs SS1 (SS1A)

The SS1K beats at a higher 21,600 bph vs the SS1/SS1A beating at 18,000 bph. The SS1K also has a larger balance wheel.

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