"It is Princess Ardalla's launch/shuttle as seen in the (Buck Rogers) pilot. It was later re-worked into the Vorvon Shuttle from that Vampire in space episode. Don't know which one. The story goes that they modified the actual Ardalla shuttle model as opposed to getting another casting.
As with many of the Hartland models, they seem to get the basic shape into a mold and then add a bunch of kit parts to the castings. Quite often, a pull from the mold will look like the final product in gereral size shape and details, but you still have to add a bunch of kit parts to it.
I can't post to the RPF, but you may post this info, as well as the attached photo.