I came arcoss this today. It's the filming model of an Ambassador class starship From TNG/DS9 same class as the Enterprise C but never used as that ship. Lots of zoomable images.
Lot # 349 : STAR TREK: THE NEXT GENERATION (T.V. Series, 1987-1994) - Light-up USS Yamaguchi and Excalibur Model Miniature
Lot # 349 : STAR TREK: THE NEXT GENERATION (T.V. Series, 1987-1994) - Light-up USS Yamaguchi and Excalibur Model Miniature