I have confirmed that the one gallon mango tree I purchased on Ebay two Aprils ago is NOT a Maha Chanok. It set fruit last year but didnt hold any. This year it held about ten till they reached this size then split! I know Cookie Monster had money on them being a Nam Doc Mai, I believe he is completely correct!
Beware of GT3000 on Ebay from Thailand. I attempted to work it out with him and he claims it is a Maha Chanok. The tree cost me $80 with shipping!!
I did get a Maha from Excalibur right after this one was purchased, it was known then as a green eating "Mahachanole" which has been confirmed to be a genuine Maha Chanok based on original import documentation (and fruit of course).
I hope this information saves someone money!!