Duke Ellington poster; Hatch Show Print, Nashville, Tenn.

Lars Larsson, the co-owner of Chisholm-Larsson Gallery in New York City, preserves and protects vintage posters and has these tips for consumers:

• Search for vintage poster dealers on the Internet to find one near you.
  
• Most vintage posters require at least some restoration, but never use glue to fix the problem.
  
• Linen backing provides strength and protection from acids without permanently adhering to the poster.
  
• A simple frame, in proportion to the poster, best displays its charm.
  
• Keep your poster out of direct light to prevent fading.