Curiously, Big Brother and the Holding Company’s album “Cheap Thrills” was “Approved by the Hells Angels” on the cover — early on, the biker gang were benefactors and provided many gigs for the band.

This slipmat is a nod to the Bennington Flag, the Revolutionary design best known for the 1777 Battle of Bennington, which was a turning point in the American fight for independence.