Luca, Etruria, AR 10 units, 3rd century BC, 4.26 g. 

Hippocamp right, dolphin left below, dolphin downwards and CC above. 
Blank. 

Sambon 24; AMB 19 (this coin); SNG ANS 17; HN Italy 98. 

Very rare.

With permission of Numismatica Ars Classica auction 114, Lot 1, May 2019
Ex Numismatica Ars Classica sale 13, 1998.