This was the very first cobalt blue glass bottle we ever found, and I believe we found it in the woods behind a cornfield in Eudora, Kansas.
Based on the shape and size of the bottle, I believe that this was a Milk of Magnesia bottle.
Embossments from bottom of bottle: 7-K-4100 / 'H-over-A' mark / Z (sideways).
The H-over-A mark belongs to the Hazel-Atlas Glass Company and was used from 1920-1964. Because the embossment 7-K-4100 is present (the letter 'K' is important for this), we can positively identify this bottle as being manufactured at the Kearns-Gorsuch bottle manufacturing plant. This plant primarily produced cobalt blue glass for Hazel-Atlas' Milk of Magnesia and Vick's jars beginning in 1925.
The sideways letter 'Z' to the right of the Hazel-Atlas trademark likely denotes the plant location in Zanesville, Ohio (pictured left in 1906).
Clear glass medicine bottle with the 1920-1964 Hazel-Atlas mark on bottom. Found in rock hole in the Tucson Mountains. Metal screw cap with surface rust but intact/solid, "welded" to the glass threads. Below the HA logo, are the numbers "2-1" No medication residue in bottle. Probably used as a canteen by a hiker 56-100 years ago. Glass surface is UV "tanned" and prismatic colors on the bottom only. The top was apparently out of the sun for all those years. This was fun. A little pandemic activity that would never have happened in life as it used to be. :-)
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