Originally Posted by
unworthy1
Given the portacatena holes in the DOs it can be no earlier than '78 (and most likely '79 is more realistic for earliest date), most of the time those DOs were in use for 1980 models and pretty much dropped out of use by '85. Having recessed Allen brake bolts yet over BB shell cable guides makes me think kind of "in between" so I'd make my guess "1982". Give or take.
Do you think that the flat fork crown would help to date it? I haven't really looked at any other examples of the frame other than those shown in the previously posted link where there really was no reference as to year. I did notice that the shell nozzle cut-outs were different on my BB shell (oblong) compared to those pictured (circular) aside from cable routing. I have no other frames with a flat fork crown.