This flier was in the large collection of Dearborn Historical Society magazines that I bought at their garage sale last spring so I'm assuming that it was an insert into one of the back issues. It's a public service announcement for a free viewing of Alistair Cooke's "America" 12 part film series at the McFadden-Ross Museum in Dearborn. I would guess that it dates to the 1980s or so.