What year did SCCA "Club Racing" begin?

["Vaughn Rockney" <vintagegarage@erols.com>]

Listers,
  I'm restoring another car for vintage racing and was wondering if the SCCA
"Club Racing" decals on it are period-correct.
What was the year that SCCA first introduced the "Club Racing" logo and
required the decals on cars?

  Thanks!

Vaughn

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