Mammillaria chionocephala

It is about 15-20 years old plant, one of my favourite in my little collection.

It's a beauty Leszek, but did you see the Reppenhagen's chionocephala? it was the first plant he received as a very young boy. The plant is now around 100 years old, so yours have a long way to go...
http://www.homepage-dienste.com/foren/F_8794/cutecast.pl?forum=13&thread=233&page=#1

Yes, I know this history, I read about this somewhere... . Long way ahead me...