The hunt continues for a second bike to add to the stable and I found this Bottecchia. Looks in good shape, but I have no idea what model it is. Columbus frame and fork are a good sign.
Frame sticker states Campione Del Mondo 66-85-86-89 which suggests to me at least the frame should be 1989 onward but the decals don't match anything from the catalogues of that era.
These are the screenshots from the ad.