It originates from Wallaceburg, a town that made most of Canadas glassware at the time. I get to have my first real garden this year. Seams also help determine the age of your jar: Seams that go all the way up the jar indicate it was machine made, probably between 1895 and 1915. What should you consider when choosing collectible jars pre-1900? Be sure and throw it away where animals wont get into it. That isnt a mistake. The company started making mason jars back in 1880, and many people today still use these for canning, or collect the jars as a hobby. But before we jump in, liets take a look at some of the history behind these vintage collectibles. Square Wide Mouth Pint - BULK, Very Old Kerr "Self Sealing" {Trade Mark Reg.} I absolutely LOVE antique canning jars! See more ideas about canning jars, mason jars, jar. lip to help keep the jar from cracking. DIY deviant.