Reminds me of Faucaria tuberculosa. http://www.cactus-art.biz/schede/FA...er_warty/Faucaria_tuberculosa_super_warty.htm
Haworthia reticulata var. reticulata? (if Id'd correctly) http://www.cactuseros.com/Detalles/Identificado/20052/VerCactus.html
it could be...the color its darker...but its the most similar i´ve found a new posibility...aloe snowflake...what do you think?
leaf arrangements are: Haworthia tend to be spiral, Gasteria 2-ranked opposite, and Aloe a less strict form of opposite. I now think this looks most like Aloe. But, truly, there are a pile of cvs and hybrids out there. (this is also to say that I now disagree with my first suggestion above.)