Livery button with slamander

This button is an unusual addition to the Douglas Archives photograph collection, most of the others bear the Douglas heart. This armorial also differs with three coronets. Whose could it be?

  • J Ruaidri Douglas

    William, I believe the top crown is a Barons crown & the bottom is a Dukes crown. Center is the Douglas chapeau. Not that this answers the question, but may provide some help with the trajectory.