Ptolemaic, Ptolemy I, as Satrap 323-305/4 BC. Tetradrachm; Ptolemaic, Ptolemy I, as Satrap 323-305/4 BC; Tetradrachm, 15.68g. CPE-70. Svoronos-164. Obv: Head of Alexander the Great r., with horn of Ammon, clad in elephant\'s skin and aegis. Rx: Athena Alkidemos advancing r., brandishing spear and holding shield; monogram, helmet and eagle on thunderbolt in r. field.Blue iridescence. Countermark in reverse field . MS