Legibility and permanence are critical when it comes to writing on any legal form. A typewriter most likely has the edge over hand printing when it comes to legibility, but the ink affixed by a pen is usually more difficult to remove, making the pen more permanent.
Both issues considered, it is probably best to fill out a certificate by hand, printing legibly with a fountain pen filled with black ink. This also provides a document examiner with plenty of samples of the Notary’s writing, in case it is needed for future reference.
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