What appears to be a decent shape older Santana. Appears to be a 7 speed setup with a stoker-controlled disc brake installed for a drag. Looks to be a tall bike. The ad doesn't really tell you anything. Not year, model, frame material, (probably cro-mo steel), frame size, wheel size, (could be 27" yet in this era), components, nothing.
I'm always amazed by this. How does someone who knows nothing about bikes, let alone tandems, end up with a expensive bike like this? Anybody missing a bright yellow Santana?