CENTURY 21 Realtor Pin Real Estate Rhinestone Crystal Brooch Sold House

Well where to begin - first their tarnished - please see last pics - it's an age rainbow patina on the back side only. The front appearance wise is great. It's a regular bar pin with a secure clasp. Silver plate with entirely prong set rhinestone crystals. No dead or missing stones. Guessing late 80's? Measures 3 inches wide and 1 inch tall. Comes from box lot at auction. I shot pictures of the worst one. Some are better. Once sold their gone.