I picked up few new pointy stuff today and among them a Gras conversion. It fits Gew 88 perfectly, but the question is who did this conversion? Original French script is still present and there is letter "G" stamped on a grip. I will take better pictures later.
The regimental marking on the Chassepot is most probably a Landwehr marking with the L half struck on the rivet.
If so 81.L.I.3.96 stands for 81st Landwehr Infantry Regiment, 1st Batallion, 3rd Company.