Hello, I'm new here but not new to cycling. After about 12 years off I've got the bug again. I've bought a new road and MTB but hanging in the garage is my old road bike that I used for 20 years. I was wondering if there was any value to it above the usual $100 +/- that old 70's bikes bring. It is a custom made steel frame from Tom Ritchey. This was before mountain bikes were made and he was doing custom road bikes out of his home in Palo Alto. It was all Campy Record at first but has been upgraded to Shimano 105. There still are a bunch of Campy parts left on it. It's in really good vintage shape. Any advice would be helpful. Thanks