This is a vintage MarkL brand, 8-ounce glass milk bottle.
It has an applied label that reads "MARKL Dairy Products Milk that Tastes Better West Chicago Ill." in a red diamond shape on one side. On the other side in red are 2 outlines of people, and it reads "No One ever outgrows MILK." Embossed around the bottom it reads "Half Pint Liquid MLX (1960)1148 REG Sealed."
This round bottle measures about 5.5" tall and 2.25" in diameter.
This bottle is in good pre-owned condition with some scratches.