Dave,
It's a very old local variety that i think is Figo Preto de Torres Novas (that was very common and much appreciated in this region - now very few people have this variety over here). I have other younger trees that probably are of the same variety, that produce a slightly larger fig, but the figs from this particular tree have the best flavor of them all. The tree is even older that i tough - it was planted by the grandfather of my wife and has at least 60 years.
A couple of years ago i even bought a tree of that variety, that i found on a remote nursery near Torres Novas, to confirm it, but i am still waiting for some figs - maybe this year.
Here's some photos of the tree with figs (end of August):