Robert Comsol wrote:

P.S. I'm aware of the concept of changed premises and intentions. Is there evidence that the TOS producers changed the "Starship Class" concept during the original series?
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Maybe not during TOS, because obviously they had bigger fish to fry than the minutiae of ship classes. But we do have the technical manual from the mid-70's, which elements of made it into TMP and that publication listed the Enterprise as being a Constitution-class starship. And the publication, at least at one point, had Roddenberry's blessing.
Plus, the second episode of TNG uses Constitution-class when describing the Enterprise. Roddenberry was also in charge of the production.