Trajan, Rome mint, 103-111 AD.,
Sestertius (ø 32-33 mm / 18,77 g), probably brass ("orichalcum"), axes about coin alignment ↑↓ (ca. 200°),
Obv.: IMP CAES N[ERVAE TRAI]ANO AVG GER [DAC P M TR P COS V P P] , laureate head of Trajan right.
Rev.: S P Q R OPTIMO P[RINCIPI / I] O M / S [C] , triumphal arch on the Forum Traiani, the central part surmounted by low rectangular base inscribed IOM and facing quadriga; the lateral parts with rich sculptural decoration with massive side structures decorated with panels in bas-relief, above opening, triangular tympanum on which is Jupiter standing on frieze, the whole surmouted by six-horse chariot driven by two Victories.
RIC II, p. 284, no. 572 (R) ; Coh. 548 ; BMC 842 ; Strack 387 ; CBN IV, 52, 218 ; Bauten Roms p. 56 no. 108 ; Hill, Monuments p. 50 .
double die match of both sides (same dies) as http://www.acsearch.info/search.html?id=1485322 (Ponterio & Associates, January 2013 N.Y.I.N.C., Lot. 6150 (8. January 2013))