Denarius

Obverse

Obverse legend

Reverse legend

Reverse

R P (the letters R and P under a tilde, a globule in the middle).

VINSCO CI (circular legend around a cross).

One 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=2378340&viewType=detailView.

In my opinion, the reverse legend is VINSCO CI like the one we see for charlemagne for the same mint. Link to the coin: https://www.all-your-coins.com/en/modern-coins/monnaies-carolingiennes/charlemagne-768-814/premiere-periode-768-781/denier/venasque/denier.

Seems never to have gone on sale.