Leukas, Acarnania, AR stater. ca. 454-404 BC. 20mm, 8.51 g. 

Pegasos flying left, L below.
Head of Athena left, wearing Corinthian helmet, caduceus behind head (no L).

Rhousopoulos 2378.

With permission of Heritage CSNS Signature Sale 3073, Lot 30061. April 2019.

Note: this type is often described in error as "BCD 
Acarnania 263", which has a Lambda behind Athena's head.
Apparently the L on this coin type was removed from the die.