The only place a will could get notarized is in the separate self-proving declaration, and that can be done later than the will. Thus, you have left out way too much information to answer. However, if you have a dispute about a will, you need to retain counsel IMMEDIATELY (there are very short deadlines in probate).
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As Glenn stated, a notary is only used on the self proving affidavit but this could serve as evidence of other wrongdoing. You should seek competent legal counsel immediately.
Sounds like hanky-panky to me! Get yourself a litigator used to dealing with fraudulent documents and listen to his/her advice.... Life is not like a detective show and the fact that you may have caught an inconsistency does not necessarily mean that there has been nefarious fol-de-rol... but it's worth exploring...
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Deliberately misstating the date on a will could evidence fraud, but your inquiry isn't conclusive. To determine whether you may have claims or gounds to challenge the will, I recommend you consult an attorney with expertise in wills and estates Lawrence Friedman elder, wills & estates lawyer.