Issued in August 1929 as part of the Soviet Union’s third definitive issue, this 30 kopek stamp depicts a female factory worker, reflecting the early Soviet commitment to industrial labor and the prominent role of women in socialist production. The stamp is printed in grey-violet using typography on ordinary paper, with a comb perforation of 11¾ x 12¼ and an upright watermark of Greek border and rosettes. Measuring 18.5 x 26 mm, this issue was printed without restriction and released in standard sheets of 100 stamps, as seen here. It belongs to the era of Stalin’s First Five-Year Plan, when mass industrialization and propaganda celebrating the proletariat were central to Soviet identity. The design emphasizes productivity and the dignity of labor, both core themes of 1920s socialist realism. This full sheet is postally used with well-aligned cancellations dated 29.11.1939, mostly legible and marked from Leningrad, one of the USSR’s major industrial centers and cultural capitals. The item is listed in all major catalogs: Michel SU 374AX, Stamp Number SU 423, Yvert et Tellier SU 432, Stanley Gibbons SU 550, AFA SU 386, Soloviev SU 324, Unificato SU 432, and Zagorskiy SU 237. Condition Complete used sheet with full margins, strong typographic impression, clean paper, and evenly placed circular date cancels. Estimate "$90 – 110".