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'Know thyself' is a good mantra for an influential label such as Levi’s. The brand’s iconic 501 jean turns 140 this year, and the classic shrink-to-fit jean is as relevant a style today as they were back in the 19th century.

If one needs to study up on the history of the 501, this video below and pdf are a good place to start. But Levi’s is putting out all the stops to commemorate the 501’s 140th year anniversary. It’s taken the campaign a step further with a neat timeline on the Levi’s Vintage Clothing site.

LVC has done a fine job in releasing special reissues of every 501 model over the years, but the Historic 501 Timeline is the first time all that information has been offered in a nice visual package. And it’s a lot of information. Each LVC 501 jean is made using Cone Mills denim to the exact specifications of its original model—from fit and hardware all the way down to the labels and packaging.

The illustrative timeline begins in 1890, the year Levi’s patented its riveted jeans (from 1873, the 501s were known as XX), and goes on to chronicle all the models up until 1978. It’s filled with all kinds of useful archival tidbits, marking the introduction of belt loops in 1922, the first time the now-famous red tab was sewed on in 1936 or when kids began calling them “jeans” instead of “overalls” in the 1950s.

Head on over to Levi’s Vintage Clothing to view the Historic 501 Timeline.