I was killing time looking at Billboard Magazine's archive of issues wen I came across an extremely odd picture. In the January 5, 1959 issue, page 37, there is a full page "Thank you" add from the Kingston Trio. It features a photo of the original Trio with the typical "Thank you for your support" message to D J's and a picture of the Trio. It is the photo that captured my attention. Nick and Bob have no visible instruments while Dave is holding a weird hybrid featuring a slotted head, wide (classical looking) fret board and a banjo body.
Playing with pictures years before photo-shop technology.