I got this fired case from a chap who visits battlegrounds. It is in terrible condition, barely recognisable as a case nevermind the calibre. It has been stood on by many goats. It is between a 577 Snider and a better condition Martini. Funny thing is that it has a paper covering (similar to the Snider) up to where the shoulder starts, complete with inspection hole. The case length is too long to be a Snider so I am sure it is a Martini. I have been through all my references and can find no mention of a model like this - can anyone throw any light on this Model or Mark?