… Postage or revenue stamps, stamp-postmarks, first-day covers, postal stationery (stamped paper), and the like, …
Explanatory notes
… 97.04 ‑ Postage or revenue stamps, stamp‑postmarks, first‑day covers, postal stationery (stamped paper), and the like, … stamped revenue bands, etc. (C) Stamp‑postmarks , i.e., letters bearing a postmark, but no postage stamps, used …