Copiapoa calderana - (Estimate)

Seed grown plant obtained from Gerhard Marx, grown outside at Leopoort south of Oudtshoorn in harsh conditions. The plant is many years old and has received little water, although likely more than in its natural habitat, the Atacama desert.

As per Wikipedia:
Copiapoa calderana is distributed in Chile in the Región de Atacama north of Chaldera .