Katane, Sicily, AR litra, (0.76g) c. 410 BC, signed by Procles.

Head of Selinos left, with ass ear, crowned with ivy wreath, P
behind head.
KATA-NAIWN, Winged thunderbolt with curved upper wings,
small shield to left and right. 

Sear 774; SNG Cop. 182; Rizzo plate 14, 17; BMC 47; 
Boehringer, Kataneische Li 6; Mirone 82 (same dies). 

Rare. 
Ex RCM Collection. Ex Triton XII (6 January 2009), lot 77; 
Numismatica Ars Classica 29 (11 May 2005), lot 75; Numismatica 
Ars Classica 21

with permission of cngcoins.com, Jan. 2013.