Did Gaylord Perry Begin Cheating on This Day?

On this day in 1964 Gaylord Perry threw 10 innings in relief during the 23-inning game where he got the win.  According to nationalpastime.com this game marked the first time he'd throw a spitball in a major league game.  Can that be verified?  His MLB career began in 1962.

According to Wikipedia Perry learned the spitball from Bob Shaw in 1964.  Shaw was a Giant from 1964 - 1966.

Perry even wrote a book about the spitball in 1974.  He wasn't ejected from a game for the pitch until 1982.

Back to the game -

Giants - Perry was 0-3, Willie Mays was 1-10,  Tom Haller was 4-10, Orlanda Cepeda was 3-9, Matty Alou who came in as a pinch-hitter was 0-6 and Willie McCovey was 0-1.

Perry gave up no runs in the 10 innings.

The story didn't mention that the game was a double header.  Marichal won the first game pitching a complete game.  Nice to see the winners of each game are in the Hall of Fame.  Also odd to see the relief pitcher throw more innings than Marichal's complete game in game one.