Mavr is a black plum shaped tom... is there one specifically called "Black Plum"
I am not sure where I got my original seed (2006) possibly from Gary Ibsen's Tomatofest in the States, but more likely through A4A swaps, Jeannine or City Chick.
Your question is a good one ..... have just been on web and found several references to 'Black Plum' without any further information so maybe they are all related ?
My Black Plum was only slightly elongated, Plum like, and not really Black, just a quite dark red, the flavour is pleasant and just a little sweet. Not unlike Principe Borghese (which can sometimes look a bit Plum like)