Have to admit I didn't know of an Italian sounding plum. Had a browse
of the National Collection and came up with these two
Prugna Damaschina
http://www.webvalley.co.uk/brogdale/...m.php?p_id=517

Precoce de Tour - web link to Brogdale
http://www.webvalley.co.uk/brogdale/...m.php?p_id=510

There are are over 300 plums in the National colection, so it might be
a place to browse. There aren't as many pictures of plums as there are
apples, but might give you a clue.
Clifford
Bawtry, Doncaster, South Yorkshire