...... but this is his story.
The plant shown is from the collection of "Ento" and is very old.
Although I have the photos from a long time, which is why I never published.
I found, however, in two other old collections that I have visited in recent days other plants with this label, as I show below.
So i said to Chris that privately introduced me to the same doubt, do not understand what might have happened, but the Mammillaria dyckiana that was distributed in Italy many years ago is this ..
Collezione Enzo Teodonno "Vivaio Autore"....
The plant is over than 35cm high....