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Slowly the corked top bottle began to disappear in favor of the screw top.
With the uniformity, came the possibility to create a solid seal with a screw cap.
The disk-like mark is sometimes confused with a pontil.
the pontil is actually broken glass where the metal rod used to hold the bottle while the lip was form was broken off leaving a sharp scar.
the right side is crude and was disturbed by the action of marking the marking with Owens Ring.
Owens rapidly made improvements as eh redesigned his machine numerous times and eventually over came the problems of uniformity see here.
In the neck on the right notice how just below the collar the mold seam goes complete around the neck. Both of these medicine bottles look much like their earlier counterparts.