A postcard classified here should be 'plain' — meaning it carries at most a standard postal format (address lines, postage box) without pictorial, scenic, or decorative imagery. Once a card bears a photograph, illustration, or decorative design intended to convey a message or image, it typically moves to the printed-matter or greeting-card headings. The nature and extent of the printed content, not merely the presence of ink, determines the boundary.

Folded correspondence cards — such as blank note cards with a matching envelope — may fall here if they are plain and intended for written correspondence, but the folded format and any envelope pairing can also support classification under stationery-set or envelope headings. Importers should assess whether the article is sold as a standalone card or as part of an assorted stationery set, as the latter may be classified differently.