Cubs BSA. From days when the younger boy program was not allowed to use the term 'Scouts'. Navy blue twill or Navy blue wool with yellow embroidery and cut edge . Sewn on the small-billed beanie-style cap. In the early daysof 'cubbing', this represented the joining 'badge"

"There is no Bob Cat Badge except the badge of membership (not of rank) which is on the cap, and following the general international practice of using the lowest badge as a symbol of membership. There should be no
Bob-Cat Badge. It is better strategy to offer the first badge at the completion of the first advancement rank, thus using the boy's desire for a badge as an incentive." (The (1st) Cubmaster's Packbook, © 1932, BSA)