pottery mark

I need information about the logo/nark located below this pottery, the name of the company or manufacturer of this item, along its potential value. the pottery has various iridicent colors that mix together and a surface with holes due to its original design. I can't determine that actual material due to its dark color, but I can tell that it breaks easily.

the mark or logo below the pottery looks like what it appears to be two letter "P" one after, followed by what it appears to be two crossed letter "B" in the shape of a butterfly. or it coult the be actual shape of a butterfly.

thanks.