I have always been a fan of symmetry and as a fan of symmetry, I have always loved the fact that the Seahawks organization began play shortly after our country’s 200th birthday - with their first preseason game taking place on August 1st, 1976 and their first regular season game kicking off in the Kingdome at 1:09pm PST on September 12th, 1976.
Game PDFs are courtesy of the Wayback Machine - and are pretty fun to look at!
While it is true that the organization was technically (and officially) “born” two years earlier, in 1974, when Seattle was awarded one of the league’s two expansion franchises, everyone I know considers 1976 the franchise’s actual birthyear.