Shanghai Watch Factory Caliber SS1
|Manufacturer||Shanghai Watch Factory (上海)|
|Caliber Number||SS1, SS1A, SS-1, SS-1A|
|Beats per hour||18,000 vph|
|Power Reserve||40 hours|
|Functions||Hours, minutes, central seconds|
|Country of Manufacture||China|
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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.