I am trying to build a bike which is reminiscent of those in the late 60s and early 70s. I was not able to find quite the right frame second hand, so eventually I had one custom built. I saw the frame for the first time the other day and, in my mind, the seat cluster (ie where the seat tube joins the top tube and the seat stays) is too contemporary because the seat stays join the seat tube an inch or two below the top tube, rather than at the same place as the top tube. The guy who built the frame insists that this was common, but I have spent a bit of time searching for photos of bikes from the era which have this sort of seat cluster and cannot find a single one. Any thoughts?