Diocletian. As Senior Augustus, AD 305-311/2. Æ Follis (25mm, 6.68 g, 11h). Abdication issue. Antioch mint, 1st officina. Struck circa AD 309. D N DIOCLETIANO BAEATISSIMO SEN AVG, laureate bust right, wearing imperial mantle, holding olive branch and mappa / PROVIDENTIA DEORVM QVIES AVG, Providentia standing right, extending right hand to Quies standing left, holding branch and scepter; A//•ANTO. RIC VI 113, note 3. Green patina, some red on obverse. VF. Very rare with officina letter.
From the Summer Haven Collection.
The note in RIC VI, p. 632, 3 reads: "The three personally examined specimens of this type have all shown the mintmark as •ANTO, without officina-letter."