Hellol 2find4me; Neat name and welcome to this FORUM. I am not a jar authority, but the first thing I look at is the top of the finish. [ Is it ground flat - for sealing? ] That tells me that the jar might have been blown in a full height mold, and earlier than many of them. The next thing to check is the bottom and there the question is [ Is there a circular mark near the center of the bottom? ] If there is, it tells me that it is a product of the press and blow process done on an ABM (Automatic Bottle Machine) - so from there you must realize that they are collected by a lot of our members and I am sure someone else will post more advise for you.
RED Matthews