What specific accuracy margin did the Speedmaster need to maintain after enduring the full battery of environmental tests?

Answer

Within $\pm 5$ seconds per day.

The text specifies that the watch had to perform within a narrow margin, designated as $\pm 5$ seconds per day, following the conclusion of all the severe qualification trials.

What specific accuracy margin did the Speedmaster need to maintain after enduring the full battery of environmental tests?

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