The two images on the illustration depict the Fagaras Range (Romania) and Mt. Cook (New Zealand). The background shows a view from the Schwarzsee area in the Zermatt region (Switzerland) towards the Obergabelhorn (4'063 m).
Himalchuli 7'893 m (Nepal)
The image does not shows Mt. Everest, as written on the stamp. It shows a view from Mt. Shivapuri (2'718 m), located just north of Kathmandu towards the Manaslu Himal. The highest peak is the Himalchuli (Mt. Manaslu at the right). The bird is labeled as Parus major (Great Tit) but it actually seems to be Parus monticolus (Green-backed Tit).
Illustration: Dolomites in Italy, viewpoint unknown up till now.