This is an old unused colour postcard, probably from around the 1960s or so of Glamis Castle, near Forfar, Angus, the Seat of the Earl of Strathmore. It is a J Arthur Dixon Natural Colour Photogravure Post Card, printed and published by J Arthur Dixon Ltd, Inverness, numbered 3497 and there is a narrative about the castle on the reverse. The card is in very good condition - no creases or obvious marks, with only very slight scuffing to some corners. 
(E153)