Valerian I, AE33 of Mytilene, Lesbos. 253-260 AD. 19.23 g. Bal(...) Aristomachus, strategus. 

AVT K P LIK OYALERIANOC, laureate and cuirassed bust left, 
holding spear and shield decorated with aegis.
EPI CTR BAL ARICTOMA-XO-V MYTI, LHNAIWN below, Artemis, 
drawing bow from quiver and holding bow, standing right 
in biga drawn by stags. 

SNG von Aulock 1759 (same dies). 

Estimate: 1000 USD

Used with permission of CNG coins, www.cngcoins.com, Aug, 2011