Not sure if it's vintage enough, but there are lots of early to mid 90's Burleys, Santanas, Treks, Cannondales, etc. out there. My wife and I got a '94 (I think) Burley that ended up not being ideal (it has a softride beam for the stoker...she doesn't like it), so we then got a later 90's Cannondale. The Cannondale is a little odd because it's a mtb "technically" but it came with road tires stock. We upgraded it to 105 9 speed, put on 28mm Gatorskins, and added drop bars with brifters. Now it's a 26" wheeled road tandem.