I just got a similar example...except this one is genuine. I am still not sure of the attribution, but I am calling it Vandals. This one even has the legend made of dots like Wroth described. The problem with Wroth, like I mentioned earlier, is that it is outdated. Here is a quote from Medieval European Coinage by Grierson and Blackburn-- "The majority of small bronze coins tentatively attributed by Wroth to the Vandals (BMC Vand 17-42) are either not African or post-date Justinian's re-establishment of Imperial rule in 534. The Vandals did, however, produce unofficial tiny bronze coins in large quantity..." (pg 420) So, perhaps this one is an unofficial Vandals issue.
Vandals
5th century A.D.
8x9mm 0.5gm
Obverse: diademed and draped bust right with dots for legend.
Reverse: eight-pointed star within wreath.
Carthage mint
BMC Vandals 165 - 172