One thing that I neglected to mention earlier is that the double bend top tube is a cost effective method to lower the head tube. It allows you to use conventional lugs, as the tubes enter the lugs horizontally. Bending the tube is cheaper than creating custom angle lugs or fillet brazing the frame. TIG welding and a sloping straight tube could have been used, as it was being employed on ATBs of the era, but it was likely dismissed due to road cyclists' preference for lugged construction. This cost concessions, along with the dropout eyelets and Tange Infinity tubeset only reinforces my belief that this was intended as an economical TT/Triathlon model. I'm also wondering if it may have been offered only as a frameset. While this would be in contradiction with the level it would not be in appropriate given the intended purpose.