Looks like Gumrah (Askok Kumar, Mala Sinha, Sunil Dutt) was remade twice once as Dahleez and second as Bewafa.
Also, Shammi Kapoor's China Town was remade as AB's Don and Dilip Kumar's Ram Aur Shyam become Hema Malini's Seeta aur Geeta.
Did you know;
1) lata mangeskhar has never playbacked for o.p.nayyar.
2) laxmikant pyarelal was assistant to kalyanji anandji before hitting big with parasmani in 1964.
3) rajesh khanna was to star as james bond in bollywood take on the super spy in 70's before indian proucers were threatened with copyright infringement by albert r.broccoli
copyright holders for 007.
4) Zahira was the first indian actress to appear as a bond girl in, on her majesty's secret service (1969).
5) amitabh's don is based on china town (1963) starring shammi kapoor & helen.6) sadhna was the first female star to make her directorial
debut in 70's with geeta mera naam (sunil dutt & feroz khan).
7) before hema malini, dharmendra had a torrid affair with late meena kumari.they appeared together in about half a dozen movies in 60's.
8.) raj kumar replaced dharmendra in pakeezah.
9) mahmood gave r.d.burman his first big break in chotte nawab (1962).
10) waheeda rehman replaced vyjantimala in ram aur shyam.
more oldies titbits later.
lakeshore
