The Heraldry image is of an "Edmonstone / Edmonston" Shield or Arms and specifically NOT for the Family Seton.
Edmonstone / Edmonston has never been a Branch of the family Seton.
In the first edition of Burke's Peerage . . . Burke was sadly mistaken in Vol I.
I will post the correcting image to this profile for: Sir John Seton, 2nd Lord Seton.
I have 45+ years of extensive study of the Edmonstone's / Edmonston's and all of its name variations can bee seen @ https://www.wikitree.com/wiki/Space:Edmonstone_Clan of which I created several years ago.
My Mother: Donna Marie (Edmonston) Vickery Birth name: Donna Marie Edmonston. Signed: John P Vickery IV