By the 1950s, Hopalong Cassidy and his horse Topper appeared in comic books, on records and were produced as toys, household objects and numerous other items that today keep collectors hoppin` in ...

Hopalong Cassidy was introduced in 1907 as a fictional character in a story by Clarence E. Mulford. ... toys and other merchandise. One rare Hopalong Cassidy item is a 1949 Rollfast bicycle.

The most plentiful Hopalong Cassidy milk bottles are the quarts, followed in scarcity by half-pints, half-gallons and pints. Quarts sell in the $25 to $45 range, pints in the $50 to 475 range.

The 10,000-square-foot museum holds several thousand items of Hopalong memorabilia and includes the 250-seat Bar-20 Theatre that will play Hopalong Cassidy movies.

She proposed the theme of Hopalong Cassidy for a Cambridge spring festival as a way to distinguish it from other communities' gatherings. So she started doing research into Boyd, who died in 1972.