Ohio Key Chain. A Larger Key Ring and Smaller Key Ring are Linked by Knob Connection with a Coin Charm Style Fob in the Middle. Larger Key Ring is About 1 1/4 Inches in Diameter, The Smaller Key Ring is About One Inch in Diameter and the Fob is About One Inch in Diameter. Front of the Fob shows a Map of the State of Ohio and Landmarks. All Blue Print is Strong and True. The Fob is a Silver Colored Metal with Blue Print. Unknown Metal, Unknown Vintage and Unknown Origin. Used but Not Abused.