Shanghai Watch Factory Caliber A581
|Manufacturer||Shanghai Watch Factory (上海)|
|Caliber Number||A581, A-581, 581|
|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 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.