This elegant taxe (postage due) stamp from Monaco features a rich green ornamental frame surrounding the large numeral “1” and the inscription “Centime à percevoir” — meaning “1 centime to be collected.” Such stamps were used to indicate underpaid postage amounts due from the recipient. The intricate floral engraving reflects Monaco’s early 20th-century classical design style, influenced by French typographic aesthetics. Printed on unwatermarked paper, it forms part of Monaco’s first definitive postage due issues.