291 NGC XF Diocletian Egypt Alexandria Tetradrachm Zeus Rare R5 (26061401C)Extremely Fine Roman Egypt Alexandria billon tetradrachm coin. Struck for Emperor Diocletian in his 8th Alexandrian year, L H = 291 2 CE. Emmett 4089 8 rated as R5 (on R1 to R5 scale), Approx. 19mm (thick flan). Certified by NGC to XF. Rare reverse type with Zeus seated holding patera and scepter with eagle at feet, flanked by date letters L H. Zeus is the god of the sky in ancient Greek mythology. As the chief Greek deity, Zeus is considered the