Dating blenko glass
From the standpoint of most collectors of antique bottles, the name and location of the company the bottle was made for, and the name of the product that was originally contained in the bottle (one or both of which may be embossed on the bottle) is often considered to be of more interest or importance than the glass factory where the bottle was actually manufactured.However, this site is geared with more emphasis on the actual themselves.
Another source of confusion was the common practice of engraving the “G” (especially in the 1880-1920 period) to appear very close in similarity to a “C”, the only difference between the two being a small “tail” pointing in a downward or “southeasterly” direction on the lower right-hand side of the letter G. I will occasionally be adding more data to these pages as I uncover more accurate information.
This list primarily includes marks that represent the actual glass company that made the container.
Many marks are encountered that indicate the company whose product was contained within it, or are trademarks (“brand names”) that give no indication of who actually made the glass, and those are (with quite a few exceptions) , not included in my list.
Researcher/historian Tod Von Mechow has compiled a large quantity of in-depth information on antique beer bottles, including both pottery and glass bottles.
I would encourage anyone interested in makers’ marks on beer bottles (and soda bottles) to check out his site…..