Severus II, AV aureus, Alexandria, AD 306-307. 18 mm, 5.08 g. 

SEVERVS AVGVST, laureate head right.
CONCORDIA AVG ET CAES, Concordia standing left, holding patera and sceptre.
B in left field.
Mintmark ALE.

RIC VI Alexandria 61; Depeyrot 10/1; Calicó 4974; Sear 14653. 

With permission of cngcoins.com, May 2015.
Extremely rare. The second known for this variety.
The other published examples are in the British Museum.