… Envelopes, letter cards, plain postcards and correspondence cards, of paper or paperboard; boxes, pouches, wallets …
Explanatory notes
… ‑ Envelopes, letter cards, plain postcards and correspondence cards, of paper or paperboard; boxes, pouches, wallets … articles may be printed with addresses, names, trade marks, decorations, crests, initials, etc., merely subsidiary to … cards do not fall in this heading unless they have deckled or gilt edges or rounded corners, or are printed or …