Understanding Ball Jar Logos and Lettering

so I think we should title this vlog how to geek out on mason jars so I got this old mason jar here this is an old blue jar how you told the difference in these mason jars and again I'll post the chart so you can just pause your video and take a snapshot or however you want to do it print it off or whatever and you can later on look back at these and if you got some old mason jars or ball jars or atlas' jars or even cur jars there are ways online you can figure out how to date these things so we can geek out a little bit here on mason jars okay so the chart will show you the shapes of the lettering on these mason jars so it's fairly hard to show you on camera but what you have to look at I can't show you anything so what you have to look at here you see the lettering the way the B is shaped whether it's underlined or not that's what you're looking at right there okay so let's show you one that's different if you look at this one if you can see it it just says ball across there and it's got a little tab that sticks up on the a all right there you can see no underlined okay and it says perfect Mason look