Rollie Fingers (with his waxed old timer mustache) was the poster child of those great early 70s A's teams. Even as early as 68, I remember going to Oakland to see those A's. Dimaggio was the bench coach back then, what a thrill to see Ol Joe on the Bench. Yellow/Gold Vests and pants, with Kelly Green sleeves, two tone hats, and of course those White Cleats, what a throwback. If one's eyes weren't open, they would be quickly just seeing those colors. As well as you said, the rough looking facial hair, scrubby beards, mustaches waxed.
The doubleheader was against the Orioles. Both were just starting to reveal they would be dynasties of team for years to come. Both Robinsons, McNally, Blair, Buford, Davey Johnson, Belanger, (Palmer, Cuellar, Dobson, were soon to come), Boog Powell/ Reggie, Catfish Hunter, Vida Blue, Dobson, Blue Moon Odom, Sal Bando, Campy Campaneris, Rudi, Lacheman catching, Tony LaRussa was a utility INF, tons of other greats. Earl Weaver, with the A's quickly going from Mgrs. Bob Kennedy, Alvin Dark, John McNamara, Dick Williams and back to Al Dark again. As golden a era as any.