That would be this one.I think one of Matt Jefferies' design concepts for the Enterprise, just after the spherical hull version (now known as the USS Horizon), was pretty much the final model but upside down.
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"There she is..." I think this one is definitely the design inspiration for the USS Reliant in ST II which then gave birth to the design of the USS Grissom which, IMHO, is the evolutionary link between Enterprise and Reliant
(unfortunately nobody wants to listen to this theory, mind read my 9 page theory treatise...

Bob
P.S.
Just last week I read the anecdote Albertese was quoting. I think it was from the Star Trek Sketchbook.
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