Stanislaw Schmidt has collected and continues to collect table tennis balls. His collection is now over 1,000 unique table tennis balls. You can see the collection of balls at the Web site ttballe.org. If you are looking for information about table tennis balls, this is an incredible resource. The balls are categorized by rating, size, ball color, stamp color and design, number of stars, country of origin, and information about the producer. If you are a collector, he exchanges balls; just look for the exchange link under the individual balls.
Here are a few of my favorites: a 38mm Schildköt ball from Germany; a classic 38mm Butterfly ball from Japan; and an unnamed 38mm ball, also from Germany.
Images © Stanislaw Schmidt 2006-2009