This stamp was issued by the Russian Soviet Federative Socialist Republic (RSFSR) in 1921, during the turbulent Civil War and early Soviet period. Printed in brown, it features the classical profile of a worker’s head symbolizing labor and the socialist state. With a face value of 50 rubles, it belongs to the high-denomination issues necessitated by the rampant inflation of the era. The design is simple yet powerful, framed by ornamental scrollwork and stars, and inscribed with "РСФСР." A significant piece for collectors interested in early Soviet philately, Civil War postal history, and inflation-era issues.