Dear Richard,
I am quite interested in the Dundemor (Denmuir) family from Fife and thought the three garbs was probably obtained from their association with John earl of Huntingdon. However this association dates to the reign of Alexander II, so if a different seal was being used in the time of Alexander III maybe the three garbs was a later addition? Please drop me a message to let me know what this seal features. Thanks very much, Marty