This is a pic of the phenomenally smeggin' band the Seekers. Here's what Lillian Roxon's 1969 Rock Encyclopedia has to say about Judith and "the boys" (by the way, I don't always agree with the cynical tone of this piece, but it's a valuable source of information):
"If there hadn't been the Seekers some shrewd manager would have invented them. One cuddly girl-next-door type (complete with nose-crinkling smile) and three sober cats who looked like bank tellers. They came from Australia, singing nice harmonies for their supper on a boat bound for England. The English squares liked them immediately because they represented something they could understand and feel secure with. As for the rest, well, it was a good clean sound and the tunes were catchy.
Their sound was, for lack of a better name, pop-folk with the strong and vibrant voice of Judith Durham giving it definition and added distinction. They didn't really click in America until 'Georgy Girl' (done for the film in 1966, which went on to become a White Rock radio commercial. After that there was success wherever you looked: back in Australia, where they visited in triumph, in England, with tv show after tv show, and in America. But by the summer of 1968, inexplicably, they were tired of it all. They had never meant to stay together, they said. Durham of the exceptional voice says she'll sing solo. Bruce Woodley, who wrote "Red Rubber Ball" with Paul Simon, will probably come to America to write songs. Their last hit in England was "The Carnival Is Over," and it was."