These mangoes use cleft grafts. Apparently Tim wanted them to be grafted closer to the base but the nursery's preference was higher up. I'm guessing California growers don't have the confidence or expertise as do the Florida fruit tree grafters.
Update: I found out the root-stock is called "Criollo".
Update: I found out the root-stock is called "Criollo".
Antonio's graft line
JMT's graft line