Vintage 1983 Avon Coordinate Nail Enamel Selector - seller associate's tool

Avon Vintage 1983 Avon Coordinate Nail Enamel Selector "This is your Avon Coordinates Nail Enamel Selector it's better than a color chart... because your customer sees the nail enamel shade right on her own nails and next to her skin tone. And there's no need for you to open a tester bottle, so you save your product, too. Just slip the selector "nail" over the customer's nail so she can easily choose her favorite Coordinates Nail Enamel shade. And don't forget to suggest the coordinating shade of Coordinates Full Color Lipstick too." lol collector's item Avon Lady sales tool used for one year in 1983 questions? please ask!