Vintage milk bottle cap, HARPERS DAIRY Grade A Pasteurized Milk Phone 1661 (not marked but this is from Grand Junction Colorado), in n-mint unused new old stock condition. Bit of age toning. Size is appx. 1 5/8" in diameter. NOTE: All of the advertising items I have listed are guaranteed to be 100% authentic originals. They are all clean and ready for display. Thank you for your purchase I appreciate it.