Interesting. Thanks for the reply. Being aqua instead of brown is it mote likely a soda bottle?
I'm assuming the bottle had a label instead of being embossed like the schlitz example attached that someone else posted. The circle on the schiltz bottle is the same size as the one on mine, just without lettering.
Any idea when they moved the mold mark from the bottom to the lower side of the bottle? I'be seen a good number of them online but they all have the mold mark on the bottom.
Your bottle was blown in a mold that could take a slugplate so it would have embossing like the pic you just added, if the bottler didn't want to spend the money to have molds cut a blank was bolted into the opening and you can still see the ring where the embossed slugplate would have gone, and then he would have used only a paper label to save money. There were many bottlers who used embossed bottles AND paper labels together, the paper label would go on the other side of the bottle from the embossing, and with his or her name embossed on the bottle they were pretty much assured their bottles would be returned to them, although sometimes nefarious bottlers would steal bottles from other merchants and place paper labels directly over the embossing to hide who the bottles belonged to and they wouldn't have to buy their own bottles.
With paper label only bottles there was a very good chance you wouldn't get your bottles back and you would end spending extra money buying new bottles since your original bottles could be stolen and used by any other bottler who also only used paper labels. There was no real change from moving the mold mark from the lower side of the bottle to the bottom, some glass houses always used heel marks, some always used base embossing, and some did switch from heel marks to base embossing, while others didn't have any markings at all, just a matter of preference