Originally Posted by
auchencrow
The frame weighs between 4 and 5 lbs on my bathroom scale, and the seat post appears to be a 26.8, as near as I can measure with my verniers.
I think that your scale lies
(bathroom scales are not that great in small ranges - their margin of error is large). Tange #2 could be it based on the seat post size and the weight should be closer to 3.5-4 lbs. You probably got at least a mid/high end frame there, esp if it is a 70s and not an 80s bike.