I don't think we ever saw the schematic that Khan was looking at in "Space Seed". The schematic was seen in "The Trouble with Tribbles". Like I said before, if we stay within the canon and within the original series, we didn't see a Constitution
-class starship. The Making of Star Trek
classifies the USS Enterprise
as an Enterprise
Now as for the classification of the Enterprise
as a Constittution
-class starship in the Star Trek Concordance
, I am accepting this on faith alone as I have never seen the first edition. Now, I would like to know, what was Bjo Trimble's source for this information?