Originally Posted by
himespau
Yeah, that is what I was trying to get at. A number of those vintage steel frames (can't come up with brand/model names off the top of my head), don't scale top tube size with seat tube size after a certain point and I've seen at least 65 cm (and maybe 27") frames with 58-59 cm top tubes if memory serves. That plus an 80 cm stem would probably get you about right.
Miyata (and others) made some big frames back in the day. I just measured up a 1981 68cm Miyata 210 I have - 68cm ST and 58cm TT. Built this up a few years ago with modern components. On a side note, these frames (when converted to 700c) make great all-rounders. I ran some 700x42 knobbies with this frame and did a 115k gravel ride with it.