CARLVS REX FR (circular legend around a cross surrounded by a circle made up of dots, a cross between FR and CARLVS).
TARVIS (circular legend around the Karolus monogram (1) surrounded by a circle made up of dots, a cross between the letters S and T).
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/btv1b10413709s.r=charlemagne%20denier?rk=364808;4.
(1) With the letter A inscribed at the top in the diamond on the middle.
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=2449045&viewType=detailView.
This type, as well as all of its variants, shows a reverse with the legend beginning at 6 a.m., if we put the monogram in the right direction.
|N°||G||F||XF 40||AU 58||MS 63||MS 65|
Seems never to have gone on sale.