Vintage Schwinn Twinn Tandem Bicycle Classic Blue 2 Seat 1960s Original. The item "Vintage Schwinn Twinn Tandem Bicycle Classic Blue 2 Seat 1960s Original" is in sale since Thursday, January 21, 2016. This item is in the category "Sporting Goods\Cycling\Vintage Cycling\Vintage Bicycles". The seller is "rerunsllc" and is located in Clearwater, Florida. This item can be shipped to United States.