Vintage black wool multi colored crystal button blazer 2

This is a fantastic vintage blazer probably from the 70's. The materials tag is missing but it feels like it would be made of wool. It has slight padded shoulders and three front patch pockets. The back has a pleat down the center. It has a beautiful oversized button with crystals that looks more like a piece of jewelry. It is in good vintage condition with some signs of age and wear. See photos for the measurements Size 2