Your sporran is the post-1881 design. Prior to 1881, the 78th had a full dress sporran of 8 tassels; see photo below. As you may be aware, the 72nd wore trews; hence, no sporran involved The manufacture date of your sporran could be anywhere from 1881 to about 1940. If you are lucky, you may be able to date the sporran if the silver insignia is hallmarked. The hallmark would be located on the left of the upright thistle that is on the stag's head's left (wearer's coordinate system). Whatever the date, this appears to be a well made and preserved sporran. Hope this helps.
