Saudagar - Film (1973) Amitabh Bachhan & Nutan

http://en.wikipedia.org/wiki/Saudagar_(1973_film)

https://www.youtube.com/watch?v=JQlhsl8sWIw&desktop_uri=%2Fwatch%3Fv%3DJQlhsl8sWIw&app=desktop

Reviews:

• http://www.filmigeek.net/2007/04/saudagar_1973.html
• http://anuradhawarrier.blogspot.in/2011/10/1973-directed-by-sudhendhu-roy-music.html
• http://www.imdb.com/title/tt0070637/reviews

About the original Bengali novel: 
http://caravanmagazine.in/fiction-poetry/ras

Amitabh's role is extremely interesting.

Another good movie: Garm Hawa.