Originally Posted by Mos6502

A lot of people think tandems are worth a lot because they're unusual, but the truth is they're not actually very rare, and while people will agree that they're cool, not many people actually want to take one home. A person here has been listing one repeatedly for $300 for months now. But they're simply not going to get $300 for it, so they can keep dreaming.

The serial number should be on the head tube. Either that or on the rear drop out.