Diocletian. As Senior Augustus, AD 305-311/2. Æ Follis (26mm, 9,17 g). Serdica mint, 2nd officina. Struck AD 305-306. Laureate bust right, wearing imperial mantle, holding olive branch and mappa / Providentia standing right, receiving olive branch from Quies standing left, holding scepter; S-F//B//•SM•SD•.