Year issued data

As a new seller, I appreciate the Year Issued field being autofilled. I'm curious because sometimes it fills, sometimes there is no data. Just wondering why? Also in one case (first issues of Hungary it autofilled with 1971 instead of 1871). Is there a way to submit a correction OR I'd be willing to volunteer to help fill in for issues where the data isn't available if that's possible or desired. Thanks.
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