Great question. Numeric characters are not included in the script, and are best avoided. Punctuation, on the other hand, is partially included, but many characters are not, so it is also best avoided. If you include marks not present in the font, we'll do our best to remove them prior to engraving to ensure you get a fantastic looking piece, but it's safest to simply not include them at all when you tell us your message in the survey after the campaign.
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