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Interesting fact about the engraving,
kind regards Max
https://www.spaceartifactsarchive.com/2014/01/the-watches-of-apollo.html
A shame that the seller did not ask for an Extract From The Archives. Would might have helped to solve that mystery.
and back on the market....with a certificate of authenticity
https://www.chrono24.ch/omega/omega-speedmaster-professional-apollo-xi-1969--id11703248.htm
Does this imply the current movement is not the original movement that came with the watch upon delivery from factory to AD?