That my friend is a great question.
First of a line of Speedmaster Professionals I believe.
As I understand it, it was born out of the 105.002 coming to an end. Then lines split into the 105.003 and 105.012. The 105.012 carried a new case design that protected the pushers and crown. So important for that reason.
But more importantly it relates to the Apollo 11 Mission. (Goggle Armstrong and Collins)
Lunar Landing.
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