50 Sestertius Diocletian

This is a modern fantasy or commemorative piece — no 50 Sestertius denomination existed under Diocletian, and the Roman Empire issued no paper currency at any point in its history. The sestertius was a brass coin, effectively dead as circulating currency well before Diocletian's reign, replaced in practical use by the antoninianus and later the follis introduced under Diocletian's own monetary reforms of around 294 AD.

The 2007 date places this firmly as a novelty item, almost certainly produced for the collector or tourism market, with no issuing authority in any legitimate sense.