Andrey, You seem to have the same link I have concerning the four different Stupikes. The one I said I didn't want to look for in my faves. LOL
I thought they had numbers but now when I see what you cut and pasted I do remember that they were given extra strain names.
No, if from the 50's they wouldn't be considered commercial heirlooms, by those of us who have set about 1940 as the cut off date.
There are also those who maintain if a variety has been grown for 50 years it's an heirloom, which makes it a moving target.
That is, in 2005 it's not an heirloom and in 2006 the 50 years has passed and it's now an heirloom.
Carolyn