traditionaltree.org claims it is diploid (AA) and from the Philippines.
www.traditionaltree.org
from another website...
"Small quantities of 'Amas' (AA, 'Figue sucrée') banana are imported from the Philippines to Japan, where it is called 'Senorita'. The variety ripens quickly in tropical climates and, picked green for export, conserves its astringency during ripening."