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Lot # 665 | P | Scott # 405
| 1928, 10th Anniversary of the Red Army, imperforated proof of aviator 28k in dark blue, large margins all around, full OG, LH, VF and very rare, expertized by Mikulski, ex-Liphschutz (lot #2612 of the Harmers Auctions SA, February 1994) . |