It is often claimed to be Seltmann Vohenstrauss, due to the similarity between the crowns. So far, I have not found out what the term "Piren" means in the context of German china. I have also not yet found a single Seltmann-marked "Piren" item, so I am inclined to agree with those who say this china is actually of Italian ("fake Bavaria") origin. This could be further supported by the overly elaborate decoration designs.

M260304a
Crowned "BAVARIA" above the term "PIREN".