What element of the initial testing process has ensured the Speedmaster maintains a high level of trust compared to other modern chronographs?

Answer

The historical precedent of passing that specific, brutal test cycle to earn the qualification stamp.

The Speedmaster secured its unique position because no other manufacturer has publicly matched the record of successfully passing those initial endurance tests required for direct NASA qualification.

What element of the initial testing process has ensured the Speedmaster maintains a high level of trust compared to other modern chronographs?
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