Hello Corrado & Rina,
It is very difficult to distinguish small Leontopodium species. There are probably also some species in Asia which are not yet discovered or described. There are also local differences of the same kind.
My tendency is with your plant to L. pusillium. When my wakes from the winter sleep I will try to compare.
In any case you should reap the seeds and try to multiply ... It is a very beautiful specimen.
Best regards Thomas