These stamps were issued by the People’s Republic of Romania to promote the nation’s first postwar Five-Year Plan (1951–1955).

• 1 Leu (black): Depicts Romania’s oil industry, highlighting the 1955 target of 10 million tons of crude oil production.

• 2 Lei (brown): Features a miner, symbolizing coal production, with the goal of 8,553,000 tons annually.

• 11 Lei (blue): Shows a hydroelectric dam, emphasizing the planned electric capacity surpassing 1,700,000 kW by 1955.

Each stamp bears the inscription Planul Cincinal 1951–1955 and reflects the socialist industrialization drive under the communist regime. These issues are prized by collectors of political propaganda, industrial themes, and Eastern European history.