Vintage 1980s Antique Enameled Gold Tone Y Volunteer YMCA Button Pin

Brand New Old Stock Vintage 1980s Antique Enameled Gold Tone "Y Volunteer" YMCA YWCA Pinback Button Brooch Pin Flair Health Fitness Family Measures roughly 3/4" long x 1/2" wide, and remains unused in its original plastic jewel case. Please note-upon photographing & listing this item, I removed the pin from its foam bedding for the first time...the foam is dry & crumbly. The photos of the back of the pin appear to be rusted in photos...it's NOT...the metal itself, upon close inspection, is unoxidized, unaged, and in brand new condition...the discoloration appears to be some kind of oily residue that easily wipes off...I'm thinking perhaps it's a residual byproduct oil of the package's foam padding breaking down over the years. Sold as pictured.