It's very easy to make circular rubber stamp.!! Nicaragua 100 years of cinema FDC cancellation is Forged.!! You will find similar in all 1998 Gandhi FDC from Africa and South America countries.!!
Now think what are the CHANCES of getting cover with FORGED stamps?
7) ... you can think all.!!
As you know I am just a novice collector who is sharing experience of 4+ years in Gandhi philatelic collection so I don't know whether all or some of the above Gandhi Philatelic material such as Indian stamps, India F.D.C, India First Day cover with Gandhi stamps issued in 1948 are Genuine or forged.
Also I am not expert (like BPA or RPS or other expertizing issuing society or club or individual philatelist) to look in depth but I am just guessing possibilities in 1948 Gandhi used covers and private personal India first day cover with Gandhi stamps as well as official first day cover of India.
I am just expressing my opinion or view or freedom of speech on the trends and I am reporting that only, what I see with my eyes and think with my brain. It's like a personal opinion, but might help.
So it's up to all collectors to think and "BE YOUR OWN EXPERT".!!
It's up to INVESTOR (not collector, as they already know all this and are involved since last 30-40-50 years) to decide whether it's Genuine or Forged as they have to pay money for investment and no one is there to protect it like financial investment like bank CD or fixed deposit or Bonds or even stocks too (where government will get involved in making rules and also bail out).
Gandhi Stamps Club.