Lovely plant! I usually shy away from making assumptions about noids, but your plant (and other photos on the web) sure do bear a striking resemblance to this plant. Are there any other very similar hybrids/possibilities? I think a lot of Zygopetalum hybrids have similar shape/coloration, but this one does share with Rhein Moonlight the solid maroon-purple sepals/petals with the subtle green tips and the nearly solid magenta lip with white spotting around the edge.
Maybe I'll start (
casually) referring to it as a Rhein Moonlight.