| 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 | (Add yours to the comments below) |
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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