For your consideration, here is an Old Hulbert Car Dealership Metal Keychain, with Buick Emblem from Olympia, Washington.  It has some wear on it.  It has a diameter of 1 7/8 inches.  It will be mailed in a box for protection.  Item pictured is the actual item up for sale and comes from a non-smoking household.  (680.2c16b-.4bx2)