Official Seal, 1919, black, perf 12. Two singles, each with small purple "Shanghai" handstamp, affixed to seal flap on 2¢ red entire cancelled by light strike of "U.S. Pos. Service, Shanghai, China, Mar" duplex datestamp on cover to Bristol Ct., Very Fine and rare, one of only two recorded usages of seals used at the U.S. Postal Agency in Shanghai China. Scott No. OX21  Estimate $2,000 - 3,000. $0 (Image)

Official Seal, 1919, black, perf 12. Two singles used on 1919 registered cover to Hong Kong prepaid with 1¢, 2¢ & 5¢ Huegonot-Walloon (614-616) issue plus #549, 556 singles on 1¢ Columbian entire, Hong Kong official seals added when envelope was opened for forwarding address, forwarded to Nevers, France, then Rouen, France, returned to United States where sent to Washington D.C. DLO, Fine and colorful use, one of only two recorded usages with Hong Kong seals. Scott No. OX21  Estimate $300 - 400. $0 (Image)

Official Seal, 1919, black, perf 12. Four different charred covers comprising 1960 post office fire at La Porte Ind., 1929 first flight plane crash, 1960 railway mail car fire at Cadiz Cal., and 1960 mail chute fire at New York City, Very Fine and scarce group. Scott No. OX21  Estimate $300 - 400. $0 (Image)

Official Seal, 1919, black, perf 12. Three Post Office business postal card usages repaired with seals, Very Fine, this group represents all recorded examples on official Post Office cards. Scott No. OX21  Estimate $200 - 300. $0 (Image)

Official Seal, 1919, black, perf 12. Four seals tied by "U.S. Ger. Sea Post, S.S. Washington" cds on cover bearing 5¢ dark blue (557) tied by "Saint Louis Mo. Jul 23 1937" machine cancel on cover to Germany, "Received in Bad Order, U.S. Sea Post" handstamp, Very Fine, the only recorded sea post use of the 1919 seals. Scott No. OX21  Estimate $150 - 200. $0 (Image)

Official Seal, 1919, black, perf 12. Two singles tied by "San Juan, P.R. Registered Dec 5 1929" postmarks on reverse of registered cover from Iraq to Puerto Rico, Fine, the only recorded use of the 1919 type 1 seals in Puerto Rico. Scott No. OX21  Estimate $150 - 200. $0 (Image)

Official Seal, 1919, black, perf 12. Two singles on 1930 CAM-18 crash cover bearing 5¢ Beacon (C11) tied by "Salt Lake City Jan 10 1930" duplex to Chicago, purple "Damaged by Plane Fire Sidney Nebr Jan 10. 1930", Fine and scarce. Scott No. OX21  Estimate $100 - 150. $0 (Image)

Official Seal, 1919, black, perf 12. Gutter multiple with tete-beche pairs showing portions of four panes, unused, unused, F.-V.F., one of only two recorded examples. Scott No. OX21 var.  Estimate $100 - 150. $0 (Image)