For those without the book (A Journey Through Time). The text says that case ref ST 145.0022 from 1971 and onward used the case backs: "Speedmaster medallion stamped in the centre, alone or surrounded by the circular inscriptions
Flight-qualified by NASA for all Manned Space Missions (on the top) -
The First Watch Worn on the Moon (on the bottom).
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Also, from the "Moonwatch Only":
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