What inherent advantage did the Speedmaster's mechanical nature offer over early quartz or digital watches in space?

Answer

Lacking batteries that could fail due to extreme cold

The manually wound mechanical movement was advantageous because it lacked batteries susceptible to failure due to extreme cold, and it avoided electronic components prone to electrical interference that affected early digital timekeeping.

What inherent advantage did the Speedmaster's mechanical nature offer over early quartz or digital watches in space?
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