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T EMy addled old brain, but you're right, it was at the end of his career...
Here is a source that references Spahnnie adding the Knuckler...
http://z.lee28.tripod.com/sbnslegends/id26.html
Perhaps the most amazing thing about Spahn is his longevity. After beginning his career as a fireballer, Spahn fought off old age by learning new pitches like a screw ball and eventually a knuckler. After not winning a single game before his 25th birthday (because of military service), the ageless wonder won 177 after turning 35. On April 28, 1961, five days after his 40th birthday, Spahn no-hit the Giants. Just over a year later the veteran notched his 300th career win.
I was a young Mets fan when Spahnnie came to us in 1964. On opening day we had both Yogi and Spahn on the roster, ah, for a time machine...
Clearly, you'd think of the screwbal, first, with Spahn. Aw well, f--- it, I'll leave my mistakes posted as is, don't believe in editing them out.
I do stand by my comments about his inability to beat the Dodgers, would love to know his fiinal career numbers against them...