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Shanghai Watch Factory Caliber A581

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ManufacturerShanghai Watch Factory (上海)
Caliber NumberA581, A-581, 581
Beats per hour18,000 vph
Power Reserve40 hours
Anti-Shock SystemNone
Hacking Seconds?Yes
FunctionsHours, minutes, central seconds
Country of ManufactureChina
Known Models
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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.

Venus Caliber 178
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