"Stringless Peach" mango . . . ever heard of it?
Plants sold in southern Florida about 50-60 years ago, judged by the size of the tree seen in the mid-1960s.
Excellent fruit. The tree I saw was the favorite of a farm family that owned it. Now destroyed unfortunately.
They also grew "Bombay Yellow," a polyembryonic mango of good quality. I saved one of those by seed.