It is helpful, and thanks for your well-thought response.
I agree with everything you stated. I have only seen that blank size Wilson tag on pro jerseys and major college jerseys (of all sports).

Of course, this could be a high school shirt. 1000's of HS and college teams used those sleeve stripes and colors.
We must not forget that "pro" does not necessarily mean "NFL". There were many professional football leagues in the 60s. The Continental League, Eastern League and the Canadian League.
I wish I had bid more than $128. Doing the research alone, would have been worth it.

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