According to dialogue in Star Trek II: The Wrath of Khan, Chekov was on board the Enterprise during the events in TOS: "Space Seed". It's possible Chekov wasn't a bridge officer at the time and worked on the lower decks of the ship.
According to McCoy, this happened six months prior to the USS Enterprise's arrival at Ekos.
This happened six months prior to the USS Enterprise discovering the thought to be abandoned USS Exeter orbiting Omega IV.


He may be exaggerating or estimating the number at a round figure.



2266 23rd century

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