Smithsonian Institution Key Chain. A Charm Style Fob with Scalloped Edges. Front of Fob shows Smithsonian Institution Washington DC Around a Sunburst. Silver Colored Metal with Aqua Baby Blue Print. Back of Fob is a blank thatched surface. Fob is About 7/8 Inches in Diameter. Unknown Metal Material, Unknown Origin and Unknown Vintage. All Working Parts in Good Order. Used, But not Abused.