That's a Schwinn Tempo judging from the fork crown. Tenax tubed Schwinns, though not rare, aren't all that common either. These Columbus Tenax tubed bikes were sold under other model names I think. Later rather than early your seems. Early '80s had chromed tips so it's less likely that they would've been painted over, speculation for now.

No great feat as the man told you Schwinn so ... deduction figures in.