If no one here has a guess, try the tomato forum; those folks really know their tomatoes! Also, was your mother-in-law's neighbor Italian by any chance?

This post was edited by susanc on Tue, Apr 1, 14 at 21:45

ÿ don't know but
Kinda looks like:
Téton de Vénus Rouge or Téton de Vénus Jaune
good luck!
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Do you know size or color? It will help narrow the field. A few I know with pointed tips are "principe borghese" and "Amish paste." Be sure to also look at ones with "heart" in the name.

FataMorgana

Oh, so sorry, I meant to say that they turn red when ripe, that photo is not all the way ripe yet. Here's the other one with a hand for scale.

PS pretty sure the neighbor was 100% English ... this was in a little village outside Oxford and I think she'd lived there all her life.

There is an Italian heirloom tomato that looks like yours, {{gwi:191601}} AKA Piennolo del Vesuvio. {{gwi:191602}} is a pic showing fruit size.

Here is a link that might be useful: more info here