When I first heard this song from Ek Thi Ladki (1949) on Radio Ceylon on the morning show while going to school in the late fifties I had a vague feeling that I had heard it before. I kept thinking about it and other vague memories came back. I talked to my father, he corroborated and clarified. He said it was very popular and was playing everywhere, and, definitely during my uncle's wedding in 1950 all day!
Of course, being just 3 years old, I had no idea about films, singers, music, etc. But I do remember that I liked it and also sang along without understanding much of it.
Lata Didi and I go way back.
Here is a snippet of her recording from a documentary on Rajesh Khanna (BBC, 1973).
Now You Know!