Fritz, thank you so much for posting images from your father's expedition! An excellent part of mountaineering history.
Sehr toll! Tschuss...
I am sorry to put the title of this wonderful photo into question. Comparing it with many other photos of K2 and its neighbours, it might be Chongtar (Mt. Spender, the white peak in the background) and Angel Peak (the rocky double peak in more in front). I´ve never been there, but know many of these overwhelming mountains from photos. So please, if I am wrong, inform me.