CARo _ LVS (inscribed in two lines, one globule above the letter C, another under the letter L).
SCI MARTIN (circular legend around one globule surrounded by dots).
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/btv1b10413013v.r=charlemagne%20denier?rk=3819761;2.
The round shape on the reverse, between the letter S and the letter N, in my opinion, is not a globule. We see the end of the letter S which overflows in relief on this form. So it seems logical to think that this was not present on the die.
|N°||G||F||XF 40||AU 58||MS 63||MS 65|
Seems never to have gone on sale.