Maximus, AE25 of Prusia ad Hypium, Bithynia. 7.42 g.
AD 235-238.

G IOYL OVH MAXIMEINOC (K?), bare head right. Two countermarks.
PROYCIAEWN PROC YPIW, Herakles, naked, holding the Erymanthian Boar on his shoulders. 

Apparently unpublished. Not in RecGen, its supplements, Paris etc. RecGen 69 var (reverse: Herakles fighting Antaeus type).

From John Jencek's vcoins.com store 3/3/2008
US$ 350.00 	 euro 230.36
 £ 176.34        CHF 365.13
 CAD$ 345.45


Note: Searching for this coin I consulted both editions of 
RecGen, several "RecGen additions" type lists, Mionnet, 
Paris, Cologne, Imhoof (several works), Isegrim.
This coin is definitely not the Herakles and Antaeus type, nor is he holding the Cerean hind on his shoulders, (seller's original description), because no such image 
existed. The image of Herakles with the boar on his shoulder 
and without Eurystheus in a jar at his feet, is known from 
the Bithynian towns of Herakleia-Pontika and Nicaea.