4817.20 - Letter cards, plain postcards and correspondence cards:

This HTS classification, 4817.20, specifically covers letter cards, plain postcards, and correspondence cards made of paper or paperboard. These items are distinguished from other stationery products within heading 4817 by their design and intended use for short written communications. Unlike envelopes (4817.10), they do not feature a folding and sealing mechanism to enclose separate contents. Similarly, they are distinct from the boxed sets of stationery found in 4817.30, which are designed for broader assortment and storage.

The items classified under 4817.20 are typically pre-formed cards, ready for direct writing and mailing without the need for an additional enclosure. The term "plain postcards" refers to those without printed images or pre-addressed markings, while "correspondence cards" generally refer to smaller, often folded, cards designed for more personal notes.

Within this subcategory, further distinctions are made to ensure precise classification. The subcategory 4817.20.20.00 specifically addresses sheets of writing paper that are prepared for use as a combination sheet and envelope, often featuring a gummed or perforated border for folding and sealing. All other types of letter cards, plain postcards, and correspondence cards that do not fit this specific description are classified under the residual category of 4817.20.40.00.