The Columbia is early 70's, definitely Bike Boom. Actually a decent bike, not as good as a Schwinn, but definitely better than anything else American of the time, with the possible exception of a Ross.
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Syke
“No one in this world, so far as I know — and I have searched the records for years, and employed agents to help me — has ever lost money by underestimating the intelligence of the great masses of the plain people. Nor has anyone ever lost public office thereby.”
H.L. Mencken, (1926)