(First Official Postal Savings Stamped Envelopes) Postal Savings, 1911, 1¢ green & 2¢ carmine. Used entires; registered 1¢ green entire with Washington D.C. imprint to Oakland, Cal., uprated with Official Postal Savings 1911, 1¢ dark violet + 10¢ carmine (O124+O126) tied by Washington oval handstamps, registry box handstamp and transit backstamps, and registered 2¢ carmine entire with Lynn, Mass. imprint to Lynn, uprated with Official Postal Savings 1910, 2¢ black + 1911, 1¢ dark violet, top margin plate block of 6 (O121+O124) tied by Rochester, N.Y. oval handstamp, Rochester & Lynn backstamps, Very Fine, a scarce pair of covers. Scott No. UO70, UO72  Estimate $300 - 400. $0 (Image)