What does the message “Unknown signator, can be checked” mean?
It means that the key used to create that signature does not exist in your public keyring, therefor PGP complains that it cannot check the signature. If at sometime in the future, you happen to add that key to your public keyring, then the signature line will read normally. It is completely harmless to leave these non-checkable signatures in your public keyring. They neither add to nor take away from the validity of the key in question.
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