Thank you. I found it at my familys property that velonged to my great aunt and there is so many mason jars, diamond cut glassware, and coke bottles. I wish I could find who the maker is for it but I am new to the identification process. I have researched online and there is so many different companies and so much info to take in. Thank you again for the help.
I can't see what's embossed at the heel, but I'm pretty sure it has a mold number and then a stylized "GC" which stands for Glass Container Corp of Fullerton CA, which later became part of Anchor Hocking. Probably made in the 1960s-1970s. The 75 on the base may very well be the year of manufacture. Incidentally, the mark for Brockway is a B in a circle, so this jar is not made by Brockway.