Vintage milk bottle cap, BACKEBERG DAIRY Raw Milk (not marked but this is from Portland Oregon and that is written in pencil on the back), unused new old stock. See pictures for condition. Size is appx. 1 5/8" in diameter. NOTE: All of the milk bottle caps 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.