Thanks for this OP! Believe it or not, I actually remember the 'Bacaruda' commercials.... I still use the term today LOL!
My dad built and operated a successful AM station in the 50's and 60's, so us kids got exposed to all sorts of interesting promotional stuff. I lot of commercials like this were centrally produced and shipped around the country to dealers or stations on reel-to-reel tapes or record discs. Like most stations of that time, my dad's station had a separate production studio, where DJ's not on-air would make almost all of the commercials used at the station. Sometimes it was from their own authored 'copy' (approved by the advertiser), or sometimes by transcribing audio from pre-recorded audio like this onto the station's own commercial tape cartridges and then mixing in local dealer info into the finished commercial tape... which is what you hear at the end of this commercial.
Again OP, thanks for sharing this. Live radio station work was a thriving business back then, as opposed to most of the satellite feed radio today.