Rare Proetid Trilobite - Phaetonellus Planicauda

This is a rare Proetid trilobite of the species Phaetonellus planicauda with distinctive long genal spines, and many spines on it's tail. I've only seen two other examples of this species for sale. It's arched over on the matrix and would be about 1 inch long it outstretched. There is no restoration on this trilobite.