Wow, gorgeous toning on that sweet OP-treasure (congrats Mikey-Z) => wow, I think that lil' Artemis totally steals the show!! Ummm, I have a humble example to toss into your thread ...
Sicily Gela AR Litra Horse-Achelous 0.63g 13mm 465-450 BCE HGC 2 p 373 Campania AE Apollo-Achelous 275-250BCE SNG ANS 474 @Nicholas Molinari 15-June-2016 "Your ... coin is a plate coin in Potamikon, number 343 in our catalog so Sambon 663; Taliercio IIIa.16; MSP I, 343, featuring Acheloios Sebethos as a man-faced bull. Taliercio cited three examples of this type, so yours is the fourth known of that particular variety."
wow, that's awesome MZ. i reeeeeeaaaaly like MHB..but that nymph on the obverse looks amazing. and that little artemis is pretty neat also, never seen anything like that. great coin!