Originally Posted by chong

Here is the full description from Agri-Starts:
Musa 'Double' (Mahoi)
‘Double’ is a sport or mutation of the common ‘Dwarf Cavendish’, and grows similarly. This cultivar almost always produces two large heads of fruit and can occasionally produce a third. The sweet fruit is highly rated, and it can be very productive. This is a rare and unusual Musa. 'Double' will not grow double stalks until second year.

Looks like Supermario's plant is consistent with the description. "The proof is in the pudding."