This cacti is Astrophytum asterias cv Ruri kabuto x cv super kabuto.
Ruri kabuto will have azure body color when the plant was mature age.
I try to put white flecks on azure body in the new form.
I sowed seeds in 2006. Appearance of plants are mixed. Some of them have many flecks and others are intemediate or nil.
The photo is the intermediate one.