This classic Monaco definitive features a finely engraved left-facing profile of Prince Louis II, known as the “Soldier Prince,” who ruled from 1922 to 1949. Executed in rich black ink, the portrait shows exceptional line engraving typical of Mazelin’s work, with deep cross-hatching giving a sculptural effect. Issued during Monaco’s post-war definitives, this 30c value was widely used for domestic postal rates. The clean serif lettering PRINCIPAUTÉ DE MONACO enhances the formal, dignified style typical of the period. A desirable piece for collectors of Monaco engravings, princely portraiture, and classic European definitives.