4.5x5.5" from an extensive c. 1950 series of "Official Hopalong Cassidy Cards By Buzza Cardozo." This particular card is of note to gum card collectors as on the interior is an attached unopened pack of Topps Hoppy gum cards. This is the 1¢ white bkg. variety wrapper. Front of card features illustration of young boy and girl in Hoppy-inspired outfits looking at a die-cut hole in a wood fence with text reading "Well-By Gum/It's Hoppy." This opens to reveal the attached gum card pack with additional text "May Your Birthday Just Bubble Over With Joy." Additional images include boy blowing a bubble (actually the die-cut opening) and Topper is in the bkg. Blank reverse has trace of glue staining where pack is attached, however card remains NM as does the pack itself. All cards in this series are of interesting design but this is one of the nicest. Rare.