It appears to be a modern copy of this coin:
Svoronos 1117: "Ptolemy III AV Octodrachm. Alexandria mint, struck 221-205 BC under Ptolemy IV. Radiate & diademed bust of deified Ptolemy III right, in aegis & resting trident on shoulder / BASILEWS PTOMEMAIOY, radiate cornucopiae, bound with royal diadem, DI below. BMC 103, SNG Cop 196."