huntoften,
Is this mystery tomato potato leaf? If so, this may be a new very cool accidental cross - I am not aware of any multiflora types with potato leaf foliage (although they may exist, but I just did not come across them
)
Another multiflora type with similar fruit shape is Geranium Kiss (
http://tatianastomatobase.com/wiki/Geranium_Kiss.
Tania