Pickert cartridges and holders

Very glad to be back and to cast my first stone into the pond.

I’ve been searching all over for details of the cartridges and their holders used in the revolvers designed and made by Friedrich Pickert. A feature of some of the revolvers was a butt trap, covered by a hinged plate, which held a clip of some sort holding enough cartridges to re-load the cylinder once.

Pictures of the revolvers are available on the internet but the storage clip seems to have been made from unobtainium. Does anyone have any information, hopefully pictures or patent drawings? Maybe a holder or two?

Happy collecting,