Through searching for the McNiven and Cameron ads in the posting below, I found a site called The Advert Museum. Independently of that, and being an interest of mine I found some harmonica adverts. I think this might be my favourite:
I couldn’t help but notice that the harp here is one of the Hohner Aerosmith series. One of these was a promotional item for the album entitled “Honking on Bobo” (I kid you not!)
And then there was….