Sorry, I missed this point before my first reply.

If you're still interested in that idea, though, you should probably consider a bike that's really designed as a one-size-fits-all, which is fine, but it won't be vintage. But as I said before, most modern folding bikes do fit a wide range of sizes, though not usually up to your height. One that does, and which might be worth a look on your part, is the Swift-- advertised to fit anyone 5' 2" to 6' 4." I don't ride one (because it doesn't fold up small enough for my needs), but I took one for a test ride once, and it's a pretty sweet bike.

http://www.xootr.com/xootr/swift/bikes.shtml