Black Watch Sporran - Post WW1?

[blackwatch70]

I was wondering if someone could help potentially date and shed more light on this very old sporran that has just come into my possession. I acquired it from a lady who was offloading some of her late husbands militaria collection. It looks to be a Black Watch Sporran, however there are no dates or stamps on the back. I have also been having a hard time place the "St.Andrew" Badge on the cantle....all the images I have seen online have a thistle and laurels beneath his feet...this one is without.

Any help would be appreciated.

I suppose that strange sporran badge is an edwardian era collar badge (worn on collars of officers red dress doublets), somehow got onto ORs sporran intead of standard badge.