A friend of mine recently bought this coin and asked me how could this have happened. It´s a common Valentinian I, partly overstriked. Not by the same obverse die as one could expect, but one of Valens. I really have no clue, since they appear to be both official obverse coin dies. Take a look at the pictures and tell me what you make out of it. Nothing relevant to the reverse, just the blow from the overstrike. Thanks in advance!