I was once given tomato seeds by my uncle. They were saved from tomatoes grown by my grandmother during the Depression. Grandmother lived up until about 20 years ago and the uncle is now over 80 (my father is his
older brother 
.
I've grown these tomatoes for about 15 years now. They may well be the "Porter" tomato but Grandma called it "the peddlers tomato" and that probably explains how she came to have it. I have grown Grandma's tomato and Porter side-by-side and still can't figure it out. These things can get a little muddled after so many years - both genetically and historically speaking.
It's my wife who claims this tomato is her favorite. I find it a little too mild for ranking that high on my own list but I'm very pleased that she likes it. Porters is an heirloom tomato by anyone's standards. But, Grandmother's tomato is a family heirloom and has also been continuously grown for about 70 years. We call them "Pearls" and they are not only pearl-shaped but "Pearl" was Grandmother's name.
I also grow and save the seed from a wonderful pole bean given to me by a gardening friend. I really think this bean is the Cascade Giant offered by Territorial Seed Company but the friend claims it is called "King's Banquet." I feel real special having them on my table and in my garden.
Finally, I ordered seed for a round white radish from an "International Seed Company" in Rhode Island about a dozen years ago. It had the special characteristic of smooth (not hairy) leaves. The root is just fine raw but we can chop the whole plant and toss it in stir-fries. I guess some people might eat the leaves in a salad.
The seed company must have gone out of business. I can't find it or this radish, the name of which I've forgotten. I remember that it was supposed to be from Russia and after some searching, I've found that some Chinese radishes have smooth leaves. I just make sure a few plants are saved for seed and continue planting and growing the "Russian" radish.
Steve