Hi,
If you are referring to Emil "Dutch" Leonard, then yes this is his signature.
In 1938 Dutch Leonard was a pitcher for the Washington Senators, BTW.
Please see the attached photo of Emil Dutch Leonard's signature on a GPC for comparison.
Please note that there was another Dutch Leonard (HB "Dutch" Leonard) that pitched for the Red Sox and Tigers a couple of decades earlier. This is not his autograph, FWIW.
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