I just picked up a 70's/80's Gazelle tandem for next to nothing (
€55/$62) and will be restoring it a bit for some fun riding around town and for when friends from abroad come over to visit.
It's a classic 3-speed model with full chaincases and 90mm drum brakes and definitely needs some work which I will be posting about in the C&V forum in the
70's Gazelle Tandem thread.