Denmark Postage Due Stamp, Red Numeral

Denmark · 1921 · 20 øre

This is a postage due stamp, intended to be affixed by the post office to mail with insufficient postage. The design is purely functional, featuring a large numeral '20' indicating the amount due, framed by ornate scrollwork. The word 'PORTO' at the top signifies its purpose, with 'DANMARK' at the bottom.

Issued in the early 1920s, this stamp is part of a long-running series used to collect unpaid postage fees, a common practice worldwide during this period of postal development.