Mumbai, Nov 7 (TIWN) Fifty years ago on this day, Amitabh Bachchan made his Bollywood debut with KA Abbas' "Saat Hindustani". On Thursday, son Abhishek Bachchan penned a heartfelt note to celebrate the occasion.

On Thursday, son Abhishek Bachchan penned a heartfelt note to celebrate the occasion.  Taking to social media, Abhishek wrote, "Not just as a son, but as an actor and a fan... We are all blessed to witness greatness! There is so much to admire, to learn and even more to appreciate. Several generations of cinema lovers get to say we lived in the times of BACHCHAN!!! Congratulations Pa on completing 50 years in the Film industry. We now await the next 50! Love you. Amitabh Bachchan #50yrsofSaatHindustaani #50yrsofBachchan #GiveItUpForBachchan."