I think you did very well! You probably paid what it was worth, and you should be satisfied with that knowledge. Naysayers that don't have an appreciation for vintage bicycles always underestimate their value. I work part-time in a bike shop, and none of my coworkers have an appreciation for vintage bike. When I bring one of my vintage bikes into the shop, they are quick to harass me. However, after I flip that bike and make a healthy margin, they change their tune. If you are going to ride vintage bikes, you are going to have to develop thicker skin. Take pride in your bike and ride it proudly. Let your bike skills do the talking! You have a very good bike indeed!

I take every opportunity I get to show off my bikes, and you should too!