Dak Ghar 1965 Bollywood film based on an eponymous 1912 play by Rabindranath Tagore.
[1] It was directed by Zul Vellani and starred Sachin, Mukri, AK Hangal, Sudha and Satyen Kappu among others, with cameo appearances by Balraj Sahni and Sharmila Tagore.
It also had a successful run in Germany with performances in concentration camps during World War II.
[5] Amal, a young boy with an incurable disease is trapped inside the house by the local pandit-doctor's orders.
When the chowkidar tells him the new building across the road from his house is a new Post Office belonging the Raja, Amal starts fantasising about visiting the King beyond the hills, and getting a letter or delivering the letters going all around, setting out from the confine of his house.