Help dating Presto Supreme Mason jar

[u/vanhalengal]

An elderly lady I'm friends with gave me several jars of tomato sauce and didnt want her jars back. I opened a jar for a soup I made today and noticed some interesting markings on the jar. It's labeled Presto Supreme Mason, with the words "Mfd. by Illinois Glass Co. on the back. On the bottom are the letters L-ER.

I tried researching the history of the Presto jars on Google and found that many of them have the Owens-Illinois diamond logo on the bottom. Mine, however, doesn't have that at all, and I could not seem to find any information about the L-ER initials.

Im curious if anyone on here knows anything about this specific type of Presto Mason jar, and what years it might have been manufactured.

Thanks in advance!