The one You show, besides different oficina mark, has no altar under Genio's feet.
I found mine on Wildwinds http://www.wildwinds.com/coins/ric/maximinus_II/t.html
under RIC VI 146, but with workshop mark E.
Btw - how to You assess rarity for "Not in RIC" coins? Is being "Not in RIC" makes coin rare by default (I don't know how complete RIC is)? Or is it mostly "gut feeling" after checking number of occurences? For this particular coin, I couldn't find even one other, with the same reverse markings.