Phase II Study II
Nothing is known about this starship class whose construction seems to date back to the late 23rd century or earlier.

This is the second of two study models designed by Ralph McQuarrie for the cenceled TV series "Star Trek Phase II".  The model briefly appeared in "Star Trek III" in the spacedock and was probably seen on screen in TNG: "Best of Both Worlds" too.  The ship class is named "Phase II study" in this list due to the lack of a proper name.