Two days later, he was traded to the Maple Leafs for forward Tim Ecclestone and defenseman Willie Brossart. His 979-game NHL career would play out with two seasons in Toronto, 2 ½ with the St. Louis Blues and 36 games with the Atlanta Flames before he retired in 1979.
Seiling had represented Canada at the 1964 Innsbruck Olympics, and in 1972 played for Team Canada in the historic eight-game Summit Series against the Soviet Union.
He has nothing from his "career" with the Capitals but a few sepia memories; if there's a photo of him in a Washington jersey, he has never seen it.
"I stayed in a hotel and hardly even got to know my teammates," Seiling said. "We had a practice, played a game, then I was gone. There wasn't time to strike up any kind of relationship."
Seiling's single game was but a footnote for the Capitals, who had many forgettable moments during that first season; they finished 8-67-5 (five ties) and were outscored 446-181.
Seiling would enjoy a fine post-hockey career in horse racing and with the Ontario Jockey Club, and for 13 years he was president of the Greater Toronto Hotel Association. Today, he and his wife, Sharon, live in Waterloo, Ontario, where he volunteers one day a week at a local golf course "to get out of the house a bit - and for the golf privileges."
He says he'll be watching Game 5 of the Stanley Cup Final on Thursday, as he has the four games before it, hoping "his" Capitals can seal the deal, at long last.