Hedgehogs are among the most common forms of faience oil flasks. The center of production of these vases has traditionally been identified as Naucratis, a Greek trading colony on the Nile Delta, in Egypt.
Alexander, Christine. 1929. "Miscellaneous Accessions in the Classical Department." Bulletin of the Metropolitan Museum of Art, 24(7): p. 203, fig. 5.
Richter, Gisela M. A. 1953. Handbook of the Greek Collection. p. 43, Cambridge, Mass.: Harvard University Press.