The original red-lines had steel collector's buttons that came with each car, these usually got lost, but some people kept them. Later buttons were plastic, as are the button with the anniversary issues (with stickers in the middle). Value ranges from $3 up to $15 depending on the car depicted. I picked up a car on a card missing the button for $7, and then walked down the aisle at a toy show and picked up the button for $3 to get a complete carded car once.
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