Group portrait on a mountain pass c1960

A portrait of a group standing against the rail of a mountain pass.

This is another high quality picture, this time of a group of people who have stopped during a walk on a mountain path to have their photo taken. The man to the left of the picture is the man who was in a picture published a few moments ago.

It was only after I'd looked at the picture a few times that I realised that as well as the obvious featured group, there is another figure hidden in the shadows of the cliff - presumably the partner of the person who is taking the picture. It was also after the second or third careful viewing that I wondered if the two girls in the picture are sisters - they do look very much alike.

The location is unknown, but behind the figures it's possible to see a lake far below in the valley, so I assume this is one of the lakes in Switzerland, France or Italy.

The date is also unknown, but the clothes being worn suggest this is probably between 1958 and 1962?