Thanks everyone for your great input! Truely informative! Since it doesn't seem to be a rare piece I'll probably just put it on ebay for someone who may be collecting these kind of jars like Gunther said. Thanks again!
I also just realized by an awesome link I saw here that this jar was made between 1923-1933 (no line under the word "Ball")
I would love any help anyone could give me at all, everything is appreciated :-)
I have this jar that I picked up locally at an estate sale...it is a large (about 9" tall) blue Ball Perfect Mason jar with a 9 on the bottom. The odd thing is that some of the letters in the words "PERFECT MASON" are missing...well, they are there but you can barely see them, they are not...