This plate block of 4 stamps featuring the petroleum industry and an oil derrick is in mint never hinged condition. The stamps are from the United States, specifically issued between 1951-1960. They have not been modified and are uncertified. The denomination is 4 cents and the topic is business, industry, and careers. This is a great addition to any stamp collection, especially for those interested in the history of the American petroleum industry. SAVE 10% WHEN YOU BUY MORE STAMPS