What critical contingency value does the hand-wound Speedmaster retain on contemporary missions?

Answer

It serves as an invaluable physical backup because it is unreliant on battery power or complex electronics.

In scenarios like a major software failure aboard the ISS, the mechanical, hand-wound Speedmaster functions as an essential backup device because it does not depend on complex electronics or battery power.

What critical contingency value does the hand-wound Speedmaster retain on contemporary missions?
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