292 NGC Ch XF Diocletian Roman Egypt Alexandria Tetradrachm Athena Mint Error (21090202C)Emperor Diocletian dated Roman Egypt Alexandria billon tetradrachm coin. 6. 96g, Emmett 4028 9 rated as R3 (does not reference the date error). Minted in the 9th (L ENATOV) Alexandrian year for Diocletian which corresponds to 292 3 CE. The date is presented retrograde as ENATOV L (L is reversed), a mint error! Correct presentation would be L ENATOV, from left to right. Minted Workshop Alpha (A below ex. line). Certified by NGC to Ch XF. Reverse Athena