Knox Glass Bottle Co. Pharmacy Bottle of 6 Drams.

 

Graduated Pharmacy Bottle.

I've found tons of these kinds of pharmacy bottles that were made so the pharmacy could affix their own paper labels.  They are one of the most common types of bottles, and not nearly as nice as pharmacy bottles bearing embossed labels showing the name of the pharmacy.  They come in a wide variety of sizes, and I've posted a few of the other sizes.

This one has a bottle maker's mark on the bottom.  It is a J in a Keystone.

Bottom of Same Pharmacy Bottle.

That is hte mark of the Knox Glass Bottle Company, used on containers made at their Jackson, Mississippi factory location (1932-1953). 

J in a Keystone (1932-1952) The Knox Glass Bottle Co., Jackson, Mississippi, used the J-in-a-keystone mark (Figure 5) from its inception in 1932 (Toulouse 1971:271) until 1952, when Chester Underwood was ousted, and all plants switched to K in a keystone.

So that pretty well dates this bottle to a twenty year period as well as the plant where it was manufactured.

Here is a link for more about the Knox glass company, which had numerous plants

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On the shoulder of this bottle is is the following mark.

Mark on Bottle Indicating 6 Drams.

The first mark, which looks something like a "3" is the symbol for dram, a measure of volume.  A dram is 1/16 of an ounce (1.772 grams) for weight or 1/8 of a fluid ounce (≈3.70 ml) for liquid.

The mark indicates the total volume of the bottle, so the mark indicates the volume of the bottle is 6 (vi) drams.

I've some bottles with smaller pharmacy bottles as little as 2 (ii) drams.