Did not know what a brakteat was, so had to look it up. Figure others may want to know too:
A bracteate (from the Latin bractea, a thin piece of metal) is a flat, thin, single-sided gold coin produced in Northern Europe predominantly during the Migration Period of the Germanic Iron Age (in Sweden this includes the Vendel era), but the name is also used for later produced coins of silver produced in central Europe during the early Middle Ages. The native proto-Norse term, from the evidence of the Tjurkö bracteate inscription, appears to have been walha-kurn, "Welsh (i.e. Roman) grain (for coin)".
Because this coin was so thin, the design on one side tended to obliterate that on the other. For all practical purposes, this made these coins uniface.