Ptolemy Keraunos, King of Macedonia, 281-279 BC. AE12, 1.99 gr.

Obv: Diademed, veiled and draped bust of Arsinöe II right.
Rev: BASY PTOL, eagle standing left. 

Arslan & Ozen 29-55; Klein 814.
Very rare. 

With permission of cngcoins.com, auction 78, lot 435. 
Sold For $650.