Late Hellenistic mold-made lamp, 2nd to 1st century BC. This nice lamp measures 35mm (1-1/2") tall, and 63mm (2-1/2") from tip to handle. It has a small crack under the spout. It is possibly of South Italy origin.
See Oil Lamps of the Holy Land: The Adler Collection #60 and A Catalogue of the Lamps in the British Museum: I: Greek, Hellenistic, and Early Roman Pottery Lamps, Q708 for similar examples.