Guam, 1899, $1 black, type I. Tied by "Guam, Isl. Guam/Jun. 10 6PM 1905" duplex on Zug correspondence registered cover to Everett Wash., manuscript. registry no. and also red "Guam, Guam/Registered/Jun. 10, 1905" cds, receiving backstamp, Very Fine and choice, scarce used on cover. Scott No. 12  Estimate $1,000 - 1,500. $0 (Image)

Guam, 1899, 50¢ orange + 10¢ blue, special delivery, five dots in curved frame above messenger. Tied by "Agana, Island of Guam/Apr. 29, 1902" cds on registered cover to Otto Bickel in Berlin, Germany, manuscript registry no. and purple "Agana, Island of Guam" straightline handstamp, Manila and receiving backstamps, trivial edgewear, Very Fine and scarce, especially with the "five dots" variety of the Special Delivery issue. Scott No. 11+E1a  Estimate $1,500 - 2,000. $0 (Image)