This compact, easy-to-read primer-suitable for both novice and experienced collectors-provides cutting-edge analysis to identify, value, and purchase investment-grade vintage baseball and football cards. Inside you will find answers to questions you never even thought to ask: What are the three main types of scarcity, and why do only two of them matter? What is the difference between organic and design scarcity, and which one is more desirable? Why is the 1962 Topps Willie Mays card graded PSA-8 more than twice as valuable as the 1960 Topps Willie Mays card graded PSA-8.5? What is the most undervalued vintage football set? Why is the 1968 Topps Mickey Mantle card graded PSA-10 a steal at $45,000? Why do football cards offer better percentage growth prospects than baseball cards? Why are PSA-8.5 cards so often undervalued? Whether you have thousands to spend or just a few hundred, this Primer will help you better understand the benefits and risks of investing in vintage baseball and football cards. Author Robert Jeffries is a long-time collector of vintage baseball and football cards. Contact him at robert.jeffries.writer@gmail.com.