Oh, I can attached one picture...

Looks like a native persimmon to me. That's usually what's used in this country as kaki rootstock, I believe. The purple ones are beyond ripe- they have turned from orange, right?

How do you like the flavor?

Stephen,

Your grafted persimmon variety died, the root stock probably D. Lotus or Date= Plum. You can graft a better variety of Kaki or American persimmon to it if you desired.

Tony

Here is a link that might be useful: D. Lotus / Date=plum

Thank you to Tony and Harvestman,

You had helped to answer the mystery. Thanks you!

Then I google the "kaki rootstock" and found these, a good read.

http://www.avocadosource.com/CAS_Yearbooks/CAS_25_1940/CAS_1940_Pg_43-44.pdf
http://www.lecooke.com/cms/le-cooke-blog/Kaki-vs-Lotus-Rootstock-for-Fuyu-Persimmon.html
http://www.hort.purdue.edu/newcrop/morton/japanese_persimmon.html