Parker in the Journal of the Royal Asiatic Society, Journal asiatique, Revue numismatique, Asiatic Quarterly, &c. (C. EL.) EPI, the French architectural term for a light finial, generally of metal, but sometimes of terra-cotta, e forming the termination of a spire or the angle of a roof.
The gable is finished with molded bargeboards and a carved finial, which on close examination appears to be dated 1647.
cabochon stone on the finial is a simple rub-over stone for setting in a bezel.