Because it was 14,702 days ago. Back when current President of Russia Vladimir Putin was 22, current President of France François Hollande was 21, current U.S. President Barack Obama was 14 and current President of Syria Bashar al-Assad was 9.
To most, this mailed advertisement for the 12th Outdoor Antique Flea Market in Boalsburg, Pennsylvania, on August 16, 1975, is a piece of junk mail that should have been thrown out 40 years ago. I might even agree, grudgingly, with that sentiment.1
But it survived four decades. It might be the last of its kind! And it does have value in that it's a record of A Thing That Happened. (Or, at least, A Thing That Was Scheduled To Happen. I suppose it's possible that a herd of local goats got loose and organizers had to cancel the flea market.)
Wouldn't it be fun to go back in time and see what kind of antiques and prices were available at this event? It bet the baked goods were tasty, too.
1. I would, however, like to additionally note for posterity that the advertising card was mailed by Betty J. Gates in Boalsburg, to Phyllis Antiques on Buford Avenue in Gettysburg.