Instructions
Contact "Dave's Vintage Bicycles" (see Resource #2). This bicycle website maintains a detailed reference photo archive of different antique bicycles and parts, as well as vintage catalogs from different bike manufacturers. The site manager will reply to requests for information about the value of an antique as long as you can provide him with detailed photos of the bike or bike parts.
Post questions about specific models on the "Retro Bike: Forum" (see Resource #1). The forum is frequented by experts and enthusiasts dedicated to specific antique models.
Visit "The Classic and Antique Bicycle Exchange" to get a clear view of the market value of antique bicycles (see Resource #3). The exchange maintains an area for antique bicycle listings as well as an area for questions.