Indeed it is newly introduced to the exchange and I have come across it this year and grafted it promptly. Here’s the description of its fruits from the label that was in the exchange.
"Asian Plum developed by Jim Doyle, fruit breeder. Medium sized, oval/heart-shaped green plum with golden flesh that’s crisp but juicy when mature. Hangs on the tree well into November. Excellent flavor and texture. The highlight of the late plum season."
Joe’s other info:
grafted 2018 to the 150-n-1 tree on Sprite, also to Nadia and Krymsk 1 all showing vigorous growth
Japanese or Asian Plum, P. salicina
Skin Color: green to yellow green
Harvest Date in Zone 9: 9/12-11/1. Good keeper on the tree!
Very similar description and characteristics to Autumn Gold and Emerald Beaut both of which have long harvest dates and are good keepers on the tree, and they sweeten up the longer they stay on the tree until birds learn that they’re ripe while yellow green and eat them all.