Septimius Severus, AE22 of Thelpusa, Peloponnesos. 1 Assarion.

L CEPTI CEVHROC PE, laureate, draped, cuirassed bust right.
QELPOUSIWN, Isis standing left by burning altar, holding 
sistrum in right hand and pail in left. 

NCP p. 102, 2. Mionnet 124.
Extremely rare. 

Courtesy of LHS Numismatik AG.
Sold for 850 Swiss Francs, ca $692