Constantine III, AR Siliqua, 1.3 gr. 407-411 AD.

DN CONSTAN-TINVS PF AVG, pearl diademed, draped, cuirassed bust right.
VICTORI-A AAAVGGGG, Roma, seated left on cuirass, holding
Victory on globe and inverted spear, the back of throne 
visible.
Mintmark LDPS.
RIC X 1528.
Extremely rare, rated R5

Sold by Ancient Numismatic Coins on ebay, June 2012.