I can tell it's not the hero model in that shot because the lights around the lower sensor dome are way too bright.You could be right. There was a 'small' version of the Enterprise built for TMP for use with distant shots. In this image, Glen Campbell is showing it off.
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Doing a Double Take - The AMT Enterprise at 55
by Glen Swanson Visual effects artist Glenn Campbell shares a rare snapshot that was taken while he was working on the set of “Star Trek: The Motion Picturculttvman.com