This was labeled as a Roberts-Hinterlader-Patrone, 1831 (Robert’s breech-loading cartridge.)
I was wondering what exactly it is.
Lewis’ SI book describes these as the following:
An English patent (no. 6137) was granted to Augustus Demondion in 1831 for a paper case with a detonating tube protruding from the rear, which was struck by a simple main-spring-hammer combination (plate lj). Another 1831 English patent (no. 6196), issued to Abraham A. Moser, describes a cartridge having a centerfire cap in its base. It was J. A. Robert’s primed case (French pat. no. 8061), however, which eventually was developed into the rimfire by later omitting the composition from the center.