Vintage milk bottle cap, PROCTOR DAIRY Rich Milk WA. 1-2440 (not marked but this is from Detroit Michigan), for Friday, unused new old stock. See pictures for condition. Size is appx. 1 5/16" 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.