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Close inspection of both bottles shows that neither have air venting marks anywhere on the bottle.
This is consistent with the flattened embossing as air vented molds allowed for the production of bottles with more distinct "sharper" embossing.
The bottle also does not have a ground down surface at the top of the finish i.
This bottle has side mold seams which fade out on the neck where indicated in the picture click to enlarge and do not show at any point above that on the bottle.At this point in the dating, the overlapping date ranges from all the questions gives the user a narrowed probable date range of to the mids for bottle "A".At this point non-pontiled base, post-bottom mold conformation, tooled finish we now have a probable date range of between the late s and for bottle "B".The user is now directed to move to the last question in the Mouth-Blown bottle section of the Dating page - Question 7 - which deals with air venting marks on the bottle surface.Air venting marks can be a very useful dating tool for bottles manufactured during the late 19th century.