Watch List notes:

ARABIA. Trajan. AD 98-117. AR Tridrachm or Tetradrachm (23mm, 10.63 g, 7h). Struck AD 112-114. Laureate bust right, wearing aegis / Three aquilae. Metcalf, Tell Kalak –; RPC III 4057. VF, lightly toned.

Traditionally thought to be tridrachms, but more recently termed tetradrachms (see K. Butcher, "The silver coinage of Roman Arabia," Judaea and Rome in Coins 65 BCE-135 CE [London, 2012], p. 208).