Please follow the link below for a detailed account of 'The seals of the Scottish Court of Exchequer' by Athol L Murray and Charles J Burnett.
If I discover any more images, I will add them to this page. Research continues ......
http://ads.ahds.ac.uk/catalogue/adsdata/arch-352-1/dissemination/pdf/vol_123/123_439_452.pdf