Luca(?), Etruria. Circa 211-206 AD. AR 5 Asses (2.16 gm). 

Hippocamp right, dolphins and X above, crescent below.
Blank. 

Vecchi 42/10 in "The Coinage of Rasna, part V", SNR 78 (1999), (this coin); SNG ANS 18.

Very rare.
Ex Spink Auction 82 (27 March 1991), lot 429.

Triton V Sale, 16 Jan 2002, lot 1015.