This was producer, director B.R. Chopra and composer Salil Chowdhury's first film together with no songs. They followed it up with another songless film "Ittefaq" (1969) a few years later.[1]
This was the third Hindi film without any songs. The first two song-less films were "Naujawan" (1937) and "Munna" (1954).[2][3][MR1]