The series ran from 1958 to 1964 and was about two former spies turned private detectives. The title refers to their office address.
As with most of Huggins' shows, there was a comic-relief character in the main cast. In this case it was Gerald Lloyd "Kookie" Kookson III (played by Edd Byrnes), the rock and roll-loving, wisecracking, hair-combing, hipster and aspiring P.I. who worked as a valet parking attendant.
Kookie was sort of a washed and polite beatnik who talked in some writer's idea of hip slang. He was meant to appeal to the "teenage girl demographic" although it's debatable as to how popular he actually was.
Is he the clown that started the "like," thing??
This issue of Dell's Four Color series, #1066, from January 1960 gives us some help with Kookie's hip talk.
Till next time, squares.