Ewiger Pfennig

The Ewiger Pfennig or eternal penny (Latin: denarius perpetuus) was a coin of the regional pfennig period (bracteate period), which was minted until the late medieval groschen time. These coins are mostly of the Hohlpfennig or "hollow pfennig" type which, unlike bracteates, had to be exchanged regularly for a fee but were not subject to annual recall of coins in circulation, the Münzverruf.