| Manufacturer | Shanghai Watch Factory (上海) |
| Caliber Number | A581, A-581, 581 |
| 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 A581 is a 17 jewels (17 zuan) manual wind mechanical movement. It is based off the A. Schild caliber AS 1194. This caliber was produced from circa March 1958 – 1967. This caliber does not have the following: no anti-shock protection system; no adjustment screws on the balance wheel; no fixing screw on the main bridge.
Similar movements in this family include the Shanghai caliber A611 with an anti-shock system, as well as the caliber A623 with a date complication.
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