These 'Scarlet Runner' seeds have been passed down through my family, from father to son, for generations. Genetically they must be at least 150 years old, but I suspect considerably older.
As non-F1 seeds they can be kept from season to season. A few beans were always left on the vine for the seeds to be kept for the following year.
I used to grow them, but in recent times they have become almost redundant; the French dwarf beans being much preferred for the table.
However, I've just found these few 'Magnon family' seeds, and will grow some (if indeed they will still grow) simply to save the seed from being lost; a sort of one-man seed bank.
I do find Scarlet Runners a little uninteresting and stringy, but I'm not going to allow myself to be the one who lets the seeds die out. I shall sow a few today; they look as if they still might grow. My fingers are crossed.