I have a bottle with a similar indentation. It sure looks like yours. It appears like my bottle & your bottle have been tumble polished. Possible not done correctly and the unprotected pontil was removed by the process.
Those are around 1905ish. The NY is a pretty decent example as there is a dedicated following for AnheuserBusch beer bottles. The Pabst is a fairly easy one to find as many have survived. They are great examples of days gone by.