Heritage Auctions, Inc. Long Beach Signature Sale 441 (28.09.2007), lot 50150, sold for $2200 

Michael II, with Theophilus. A.D. 820-829. AV solidus (20 mm, 4.38 g). 
Constantinople, A.D. 821-829. Crowned facing bust of Michael, holding 
cross potent and akakia / Crowned facing bust of Theophilus, holding 
globus cruciger and cruciform sceptre. DOC 5b; SB 1640. Near XF. 
Scarce. 

Ex Eliasberg Collection (American Numismatic Rarities, 18-19 
April 2005), 33.

Estimate: 1600-1800 USD