Thank you Francisco,
you are always helpful!
The story of that tree is this: i exchanged some cuttings with a french collector, and he gave me some bareroot saplings.
I tried to send him emails but i haven't received a reply.
The gentlemen that gave me this plant has a nursery, with hundred of varieties, including BM.
This was a mislabeled tree, i realized that after the first fruits, and there is also another mislabeled tree, a "Bourjassotte noire" that turned out to be a white fig (i have no luck with labels and fig trees, both from nurseries and trades!).
I talked about this unknown with another french man, that has a Black Madeira tree, and he said that my tree looks exactly the same as his tree, but he mainly refers to the leaves.
I did not think of this variety at all since i know is very rare.
Looking your fruits they seem to be large, more or less flattened and with a sort of neck, while those of my tree are quite different.
The color and the ribs on the surface are similar, but the pulp is not that red (maybe i have to waits some days before harvest).
I have to add that my plant has not seen a drop of rain since many months, and was watered only three times during the summer, and the shape and size of the fruits can depends on it.
I will take more pictures, i'm sorry for the quality, but i have just a low-end phone and poor intrernet line, so upload photos it's an enterprise.
Thanks again Francisco, what do you think?
Do you see any similarities between Violeta and my unknown?