The gate to Camp Jack west of Cheyenne, East of Laramie, Wyoming
When I was growing up in the 1950's, we would have our milk delivered to the house. The milk man would deliver the milk early in the morning. He would place it in a box by the back door. The milk was delivered in a glass bottle with a paper cap on the top. The color of the cap would indicate what was in the bottle. We would drink the milk, wash the bottle and return it to the box. The milk man would visit us once a week.
The dairy came up with a unique way to let the milk man know what kind of milk we wanted to order. It was a device that you would put into the top of an empty bottle. It had rotating colored tabs. The color of the tab would represent the different kinds of milk or dairy products. If we needed two quarts of milk, would put up two white tabs marked "1 Qt. Milk:. If we needed a 1/2 pint of cream, we would put up the yellow tab marked "1/2 pint cream".
Every now and then, I would I would put up the brown one marked "1 Qt. Chocolate Milk". I don't think Mom ever figured out which of us three boys did it.