Amiens (Ambianum) mint was founded by Magnentius and was closed soon after Constantius II regained control of the city. All FH coins of this mint are AE2 size. While RIC rates our coin (RIC 48, page 124) as common, this will not be the easiest one to find should you try to duplicate the set. The mintmark used by its one and only workshop is AMB which is easy to confuse with the second officina of Antioch which used ANB. Some, but not all, Amiens coins have an A behind the bust making these easy to separate from Antioch shop B. The A indicates the high weight standard and is not a city mintmark. The plain ones will require you to pay attention to styles which, fortunately, are not terribly similar. Amiens portraits often have a heavy jowl look and three distinct bands at the back of the neck. Our example shows the common horseman reaching pose 'FH3' with no clear hair detail on the barbarian. from http://www.forumancientcoins.com/dougsmith/fh.html