Made in America / Complete collection - 5 miniature sheets mint never hinged, USA

Made in America is the title of this unique series of miniature sheets from the US Postal Service. A successful homage to the work heroes of the early 20th century. Each of the twelve special stamps shows moving black and white photos based on templates. Fascinating and at the same time dramatic insights into the not always safe working world of that time. 5 miniature sheets with 12 stamps each, mint never hinged.
On the twelve black and white stamps we find an aircraft manufacturer assembling a radial engine, a crane operator on the steel frame of the unfinished Empire State Building, a hatter intern at work, a daring worker Clinging at dizzying heights to two lifting weights, the young lady at the keyboard Linotype typesetting machine with which complete lines could be cast mechanically / automatically in lead type, a welder on the steel skeleton of the Empire State Building, a miner in the coal mining at dizzying heights on one A worker driving rivets into the steel frame of the 443 m high Empire State Building with 102 floors, the tallest building in the world until 1972, a mechanic on the boiler of an engine room, a rail inspector with a pickaxe at work, a textile worker on one mechanical loom and a worker at the foot hearing a steel cable.