After some research, I think I narrowed the build date down to the '76 - '78 period:
- scalloped seat stay caps
- Colnago + club logo on flat fork crown
- very little chrome (Can't remember, but I think it didn't even have chromed stays)
- cables routed over BB
- drilled to accept recessed brake calipers.
The frame is in good condition over all, but a 6-7 out of ten cosmetically. The paint has chipped some and, at one time, was touched up in a few places with nail polish. The components are nearly new in terms of wear. This bike doesn't appear to have been ridden much, which is consistent with the seller's story. In fact, the rims have no break wear and the gears are clean and without scarring. The patina is most likely a result of careless storage.