There should only be "one" of any particular variety. If something changes or is improved, it should get a different name, because it is a different variety. So if there is any difference between Rutgers when released in the mid 1930s and Rutgers as available now, there has been crossing involved - and it is no longer Rutgers. As released as a stabilized open pollinated variety, it should be the same today as it was then.
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Craig
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