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.Beginning collectors often confuse an Owen's ring with a pontil mark and it is easy to see why this happens.
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.
I have put up pictures of the lips so that the readers can see how they mold goes all the way over the top as shown below. This is different than an older hand tooled, hand blown bottle.
The pressure from the automatic machine was strong and the molds fit tight leaving only a very thin line.
Note the diagonal line which cuts across the base is obliterated by the Owens Ring (the large off-center curcular feature). the base is crudely made for a machine made bottle.