Dating old 7up bottles
The seam on an ABM bottle will run all the way up the bottle and over the lip.
Understanding which bottles are actually antique and knowing where to buy old milk bottles can help you sort out the treasures from the trash.
Before the advent of the paper carton and the plastic milk jug, dairies would send milk men out to individual houses with glass bottles of milk.
The shape of the glass bottle, as well as its color, labeling style, and other factors can help you determine whether you have an authentic find and get a sense of your bottle's age.
Shape is one of the first indicators to look for when dating an antique bottle.
According to antiquemilkbottles.com, the shape indicates when your bottle was manufactured.