Perseus, King of Macedonia. AE19. 179-168 BC. Pella or Amphipolis mint. 5.02 g. 

Head of Perseus right in winged helmet, harpa before head.
B-A across upper fields, eagle standing front on thunderbolt, head right, wings spread. 
ER monogram in left field, harpa below. 

Mionnet Supp 3, 695; Braunschweig 749.

Sold by Gorny & Mosch auction 255, Lot 3118, March 2018.
(Description corrected, monogram misread)