Denarius, type 1

Obverse

Obverse legend

Reverse legend

Reverse

HLVDOVVICVS IMP AVG (Laureate and draped bust of Louis The Pious on the right).

METALLVM (circular legend around a die surrounded by two hammers. A cross between the two letters M). 

Photo of the copy preserved at the Bibliothèque Nationale de France (public domain), link to the page of their website showing the photo of the coin: https://gallica.bnf.fr/ark:/12148/btv1b104559850.r=louis%20le%20pieux?rk=1137344;4.

Two other copies preserved at the Bibliothèque Nationale de France (public domain), link to the page of their website showing the photo of the first coin: https://gallica.bnf.fr/ark:/12148/btv1b104423878.r=louis%20le%20pieux?rk=1094426;0. Link to the second coin: https://gallica.bnf.fr/ark:/12148/btv1b10442388q.r=louis%20le%20pieux?rk=5557967;2.

Another copy preserved at the Münzkabinett der Staatlichen Museen of Berlin, link to the page of their website showing the photo of the coin: http://www.smb-digital.de/eMuseumPlus?service=ExternalInterface&module=collection&objectId=2376322&viewType=detailView. A small triangle in front of the letter G on the obverse, unlike type 1, var 1, I think it is a die break.

Several coins sold by different auction houses.