Repository: Somerset Record Office
RefNo: DD\SAS/C795/FA/6
AccNo: C/795
Title: Thomas Coulthard of Scotby (Cumberland), Esq.
Description: Certificate of matriculation of arms in the Lyon Office, Edinburgh, 16 June 1784. [Parchment, with seal; given by Mr H D Stone, 1918].
Date: 1784

Note the comparatively late date (1784). If these were given to this Thomas Coulthard he must have been pretty old.