Crest Castle

Size approx. 15" x 12" - description of scene encased within a banner @ top "The frontis=piece of the Castle of Glammis, given by King Robert, the first of the Stewarts. in the year 1376. with his daughter to John Lyon Lord Glamis, Chancellour of Scotland, As it is now reformed by Patrick Earle of Strathmore his Lineall heire and Succesour An:Dom: 1686" under which and on either side are displayed two crests 1 showing a lion, the other fam. initiials and both topped with crowns. The castle takes up most of the picture with a single figure (gamekeeper) accompanied by a dog to the left foreground - 5 central figures one of which looms large and appears to be the earl and one figure approaching the group from the right. Signature = R. White sculp : On the back of the picture is a personal message from this era but prefer not to reveal it at this point in time. Has anyone knowledge of this etching and if original is there protocol to consider?