Vintage Burgandy Royal Mews Windsor Castle badge Pin Button Pinback

While clearing out the clutter, my husband came across this pin. He had put it away many years ago. He is finally letting go of some of his stuff. I have a hard time throwing things away and hope that this man's trash will be someone else's treasure. Please review the pictures as that speaks to the condition of the item. It measures approx. 1 1/4" diameter. Thank you for looking.