There is no philatelic expert in world who will able to prove it's genuine because it's very hard to get all kinds of details.
I think it's very tempting to forged first day cover instead of selling MINT stamps because if you see the selling price.!!
But I will not even pay $30 for this covers.!! Because to me it don't justify as collectible item and chances of forgery is very very high.
Also it will be very hard to find out whether forged stamps are affixed on this private cover as there are plenty of it available.
Following are some forgery blog post I wrote in past.
1911 First Aerial Mail post forgery card (one of the greatest philatelic blunder in forgery) with receiving and sending postmark.
|BOGUS forgery cancellation card of 1911 First Aerial Mail from Allahabad.|
|Gandhi Boycott British Goods label|
|Gandhi SERVICE FAKE Stamps and Governor Cancellation|
|FAKE 1948 Indian Embassy of Nepal cancellation and Independence day of India|
This is not COUNTERFEIT. It's BOGUS stamp.!! Because no country name on this.!!! (was selling from $43000 -$2000)
|FAKE Gandhi specimen stamp.!!|
|Forged 1948 Gandhi Nepal Indian Embassy Cancellation|
|FAKE 1948 Gandhi stamps "JAI HIND" Cancellation|
|FAKE Overprint Cameroun, Nicaragua stamps and FDC!!|
|How to create FAKE error stamps|
BIDDERS!! "hitlerandgandhi" just to glorify Gandhi stamps they increase price of 1948 Gandhi FDC and Used covers.!!! (Images are not enough to understand this so read following blog posts.!!)
I am not expert and I am in this hobby for 4 years only so you don't have to believe me or trust me. But you can think about it. There are more experts with 20-30-40-50 years sitting around with stamp hobby and there are expertizing certificate which might help you.
If you don't want to go through all this don't think as Investment and think as "Philately Greed" and you will be SAFE.
I think collector, dealers, seller, forger will do anything for money such as making BOGUS cancellation from Winnenden to celebrate non-violence for school shooting or plane crash cover, forged 1948 stamps, Nepal Indian Embassy cancellation, Gandhi SERVICE stamp with forged Sunday cancellation, letter reaching after 2 years or reaching in 3 days from India to France by removing stamps and black ink of rubber stamp etc.
It's nothing new. In stamp collection it has been going on 160+ years since Penny Black. But counterfeit or forgery is going on since 700 B.C. ( 2500+ years).
Gandhi Stamps Club.
Risk of stamp collecting in 21st Century.!!