By coincidence, I today noticed a coin from the same dies in Frank Sternberg's Auktion
XXV, 25th and 26th November 1991, Zürich, lot no. 388, there attributed to Perge with the note:
das Stück hat den gleichen Revers wie SNG v. Aulock 4591 - irrtümlich nach Aspendos gelegt. Avers dort Julia Soaemias.Sternberg reads the
legend as [ΠЄPΓ]-AIΩN. While the A is not clearly readable on the picture, I suspect it must have been clearer in hand since the reattribution to Perge is based upon the reading of AIΩN instead of ΔIΩN alone. I wouldn't want to decide from the pictures whether Sternberg was right or not.
Lars