My grandparents gave me 2 Schwinn bicycles that they have had in their basement forever. One is a Schwinn Varsity and the other is a Schwinn Collegiate 3. The Varsity seems to be older than the Collegiate. My grandparents cannot remember when they bought the bikes, but they think it was between the mid 60s to the early 70s. I need to know how I can properly identify the year in which they were made. Also, if you could give me an estimate of their value, I would greatly appreaciate it!