Dia, Bithynia, civic issue, AE 18.4 mm. 95–90 BC or 80–70 BC.

Laureate head of Zeus right. 
DIAS beneath eagle standing half-left on thunderbolt, head 
turned right. HTR monogram in left field.

RecGen 5A-1bis (Waddington's hand-written addition in the Paris BNF example of RecGen); Type Hoover HGC 453; BMC -; BMC Black Sea -; SNG France 7 -. 

Extremely rare monogram, listed only as an addition by Waddington. 

With permission of TimeLine Auctions 
(www.timelineauctions.com), Apr. 2018