My recently acquired 1970 Mark I Professional ("The White One") measures:
Seat tube: 25" c to c (63.5 cm) Top tube: 23" c to c (58.5 cm)
Haven't got my completely unmathematical mind around how to easily measure frame angles, but eyeballing this, I am guessing 72 seat tube, maybe 73 head. The Mark Is were of course quite different in frame design and possibly angles (although the proportion of seat and top tube measures seems on par with Eric's). She's not yet built up (maybe in three weeks) so I am not sure of the bb height.
Washington DC USA