FAKE
Magnentius, AE3, Siscia.

DN MAGNEN-TIVS P F AVG, bare-headed, draped and cuirassed 
bust right; A behind bust.
GLORIA ROMANORVM, Emperor on horse right, spearing enemy 
right, facing left; shield and broken spear on ground. 

Mintmark dot SIS star.

"Bought from an old collection"
Offered by Asta Tintinna Numismatica and deamoneta.com, Jun, 2011

Note: Purported, by the person who sold this to Tintinna, as 
having been found in Italy "many years ago". This is a fake
from known dies, still being produced by Bulgarian fakers 
and brought - together with thousands of other fakes - into 
Western Europe under the overly and stupidly lax EU "no
borders" laws. They are offered as genuine to collectors and 
coin dealers, with the deliberate intention to deceive and 
to make money dishonestly. 
There are no genuine coins of this type from Siscia. 
These fakes are artificially aged using hammers and chemicals.