I think it's a fair value for this FFC (if really flown in first flight) comparing 2 Gandhi OVPT stamps from Chile and also one more stamp.
Read more about Gandhi FFC and understand what's going on in FFC world.!!
Airbus A380 FFC ( Bogus FFC)
United Nations Stamp on FFC. ( Does not make sense.)
Hawaiian Airlines FFC (to make money by using Gandhi stamps.!!)
1911 First Aerial Mail from Allahabad (Fake cancellation)
Now think what are chances of First Flight departure on June 13, 1974 !!
Gandhi Stamps Club